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I am planning on building a muli level (all above ground) pond this year. The main tank will be around 500 gallons and will be reserved for my Rhino pleco's. I want to try to get them to breed in this tank. The other 2 levels will be smaller and have faster flowing water kind of like a stream of sorts. I am thnking about moving some of my corys into one of the smaller tanks. Does anyone know if this is a bad idea? I would be thankfull for any input or suggestions.

Corys are less fast-moving-loving than the plecos.

And if the pond is above ground, I'd be a bit worried about the temperature variation between winter and summer - probably ok if you get or other species from further south in South America (Uruguay, Argentina, Chile) rather than the proper tropical species from the Amazon and such.

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Mats

In a place like San Antonio, I would be quite worried about temperatures. Many of the more common Corydoras do not do well at even 80F. I suspect you often have daily average temperatures above that in your summers. If you add to that the effect of lots of sunshine, the above ground will likely go over 85F. I use a stock tank here in Illinois for some tropicals and even here I need to take strong measures to hold my water temperature below 80F during the summer months.

Thanks for the imput. This "pond" will be on my back poarch in the shade most of the day, but I think I will let it run for a season and keep a log of water temps in the diferent levels and see if it will work. I am hoping that it will work. I spend a lot of time out on that poarch and would love to see some of my favorite fish while vegging out there.