Search found 983 matches

by dw1305
Wed Sep 09, 2020 3:54 pm
Forum: Tank Talk
Topic: Using deep gravel and bacteria to control nitrogen
Replies: 111
Views: 39358

Re: Using deep gravel and bacteria to control nitrogen

Hi all, Thanks Darrel, for keeping this up to date. I'm learning a lot. Cheers, Eric I am as well, but it's back to the old problem, trying to line up all the moving bits and then work out what they actually mean in practice. I was thinking about this in terms of marine aquarists using Vodka, or sim...
by dw1305
Wed Sep 09, 2020 3:44 pm
Forum: Tank Talk
Topic: Using deep gravel and bacteria to control nitrogen
Replies: 111
Views: 39358

Re: Using deep gravel and bacteria to control nitrogen

Hi all, Last one for a bit. This paper looks at the interaction between dissolved organic carbon (DOC), nitrification and the microbial assemblage. The paper is open source, and should be available to every-one: Navada, S., Knutsen, M.F., Bakke, I. et al . (2020) Sci Rep 10 . Nitrifying biofilms dep...
by dw1305
Wed Sep 09, 2020 2:57 pm
Forum: Tank Talk
Topic: Using deep gravel and bacteria to control nitrogen
Replies: 111
Views: 39358

Re: Using deep gravel and bacteria to control nitrogen

Hi all, .....As for the AOA and AOB. I am not ready to accept the conclusions of Sauder. L. whose name appears on all of the studies I have read so far which conclude AOA are the dominant ammonia oxidizers in aquariums......... This is a paper where they didn't find any AOA, but they found a range o...
by dw1305
Wed Sep 02, 2020 8:11 pm
Forum: Taxonomy & Science News
Topic: Complete mitochondrial genome of some random loricariine misidentified in a pet store
Replies: 6
Views: 371

Re: Complete mitochondrial genome of some random loricariine misidentified in a pet store

Hi all,
Now that is interesting and a pleasant surprise, I also suppose it makes a lot more sense that the image is the issue, rather than the gene sequence.

cheers Darrel
by dw1305
Wed Sep 02, 2020 11:20 am
Forum: Taxonomy & Science News
Topic: Complete mitochondrial genome of some random loricariine misidentified in a pet store
Replies: 6
Views: 371

Re: Complete mitochondrial genome of some random loricariine misidentified in a pet store

Hi all, ....... But most disturbingly, if their fish is ANY Rineloricaria , why is their COX1 tree throwing it in with all the Sturisomatichthys and Sturisoma . It's either really poorly done molecular work, poorly chosen computer settings for performing the tree building, or it shows COX1 genes are...
by dw1305
Tue Aug 04, 2020 12:55 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, ..........I have posted this before. Petersen, Nils Risgaard‐, Jensen, Kim, (1997), Nitrification and denitrification in the rhizosphere of the aquatic macrophyte Lobelia dortmanna L., Limnology and Oceanography, 42, doi: 10.4319/lo.1997.42.3.052 https://aslopubs.onlinelibrary.wiley.com/doi/...
by dw1305
Tue Aug 04, 2020 10:28 am
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, I have Walstad's book. I thought it was very good......... I also know that she raises a lot of fish (especially fancy guppies, these days) and takes her own advice, sometimes running experiments to verify ideas. So while she could be mistaken about why something works she's promoting ideas ...
by dw1305
Mon Aug 03, 2020 5:44 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, I have Walstads book on its way in the mail but I have not read it. However I have suspicions that she is attributing too much to the plants and too little to microbes. No I don't think she is. It is always plant/microbe nitrification when you have plants, and since she wrote her book there ...
by dw1305
Mon Aug 03, 2020 5:30 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, Yes, I understand that but if the plant didn't release oxygen from the roots, the same ammonia that reached this zone would not be nitrified and could be taken up by the plant at less cost. The plant is "giving" the bacteria the oxygen that it then has to reduce again. It is really all down ...
by dw1305
Mon Aug 03, 2020 1:22 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, Do you have any thoughts or experience on my problem with pothos not growing? No, it grows in some of the tanks in the lab. in pretty much RO water. Might be a light issue? About plants bringing oxygen down into the substrate through the roots, this article by Diane Walstad says that aquatic...
by dw1305
Mon Aug 03, 2020 1:06 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, .... she wrote that people, even if they have a planted tank, misunderstand the amount of nitrogen taken up by plants. proteins from fishfood -> excreted ammonia -> proteins in plants Now our fishfood contains 30 to 50 % of proteins, and the plants around 5. That is, only if you take out aro...
by dw1305
Sun Aug 02, 2020 8:54 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, ......Overall, if you are looking for nitrate removal the way that I think is easiest and least likely to accidentally poison everything is to use fast-growing plants in the aquarium that you trim back (assuming that you remove the plant trimmings from the aquarium). That would definitely be...
by dw1305
Sat Aug 01, 2020 8:46 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, This is exactly my point! 95%(?) of hobby fish keepers, fish store staff etc, even very experienced people, have a poor understanding of the whole "filtration" process and have no desire to try. The advertisement statements made by manufacturers not only go unchallenged but become truths spr...
by dw1305
Sat Aug 01, 2020 11:00 am
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, .........I mean in common aquaristics. I have not seen any data to back up the claims of what various filters and filter media have in terms of properties or capacity. I see large sumps with several compartments, each with a different type of media. One has filter foam in sheets or cubes. Th...
by dw1305
Fri Jul 31, 2020 9:41 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, I have to disagree on the nitrate tests. There is very seldom an "off" measurement or random fluctuations. If you take a measurement every other day you don't get: 3 5 10 5 15 10.. but rather a consistent 3 3 5 5 10 10 15... Try diluting your tank water samples down, and see if that still ho...
by dw1305
Thu Jul 30, 2020 8:59 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, There are no results when I search this forum for either plenum nor Novak but are you familiar with Dr. Kevin Novak? What are your thoughts on this? I am, my thoughts are that he doesn't understand why his " UKAPS: biocenosis buckets are successful, or how they work. ". Unfortunately he has ...
by dw1305
Wed Jul 29, 2020 9:37 pm
Forum: Tank Talk
Topic: About filtration
Replies: 70
Views: 15247

Re: About filtration

Hi all, .......but I haven't got a clue to how much ammonia can be converted with 1 mg oxygen. As molar values it is NH4+ + 2O2 and as mass its 1.00 NH4 + 3.56 O2. I had 10 ppm, did a 50% water change. A few days later I measured 3 ppm and am now at 5 ppm. I'm a bit wary of nitrate test kits. Becaus...
by dw1305
Wed Jul 22, 2020 11:19 am
Forum: South American Catfishes (Callichthyidae - Corys et al)
Topic: Getting rid of snails in Pygmy corydoras tank
Replies: 12
Views: 1537

Re: Getting rid of snails in Pygmy corydoras tank

Hi all, The tank in the photo is at ~4dKH and 120 microS conductivity and the Ramshorns begin to show shell attrition from a young age and never grow very large. I probably should have posted a picture of shell attrition, this is the <" top view of the tank above ">. This is about as big as the Rams...
by dw1305
Wed Jul 22, 2020 11:11 am
Forum: South American Catfishes (Loricariidae - Plecos et al)
Topic: Peckoltia lineola breeding project - spawned, but...
Replies: 16
Views: 1721

Re: Peckoltia lineola breeding project - spawned, but...

Hi all, Yes. I put a small ramekin bowl or similar glass dish (I purchase them at thrift stores, usually for about 25-50 cents each) in each pleco tank and I add a few large pieces of gravel or very small cobblestones to each. I add the worms to the bowl so that the worms don't spread out into the s...
by dw1305
Fri Jul 03, 2020 11:17 am
Forum: South American Catfishes (Callichthyidae - Corys et al)
Topic: Getting rid of snails in Pygmy corydoras tank
Replies: 12
Views: 1537

Re: Getting rid of snails in Pygmy corydoras tank

Hi all, Thanks Darrel. I didn't realize copper was that much more effective in soft water. Tom Yes, it is one of the issues with <" acid rain ">,the lower pH solubilises metals from spoil tips etc. <" Most copper compounds "> are insoluble in water, but many of these are soluble in weak acids etc. c...