Medaka made a good effort in answering many of the questions. Here's some comments from me, with MY personal opinion, which may not be what you like...
1) what's a nice looking friendly fish to get? in UK
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2) will they breed if there are other fish living in the same tank? will the other fish eat the eggs?
As Medaka said, this depends on what catfish, and which OTHER fish you'd have there. For example, bristlenoses
, the amel will look after the eggs and the babies will be ready to fend for themselves when they come out of the cave, so if you have only small companions (small tetras, danios, etc), the fry will not be eaten. However, small fish is seens as food by bigger fish, that's natures way. So if you have any bigger fish than small tetras, most likely the babies will be eaten.
3) where do i get live food from like micro-worms?
You can buy live blood-worms and daphnia in most fish-shops. Never seen micro-worms tho', but Medaka gave a good sugggestion there.
4) how do i create a nice 'love' nest?
Depends very much on the specie of fish. Most plecos will want a cave to spawn in, where the male entices the female in, then holds her in place while she lays the eggs and the male looks after the eggs until the babies are ready to leave the cave.
Corydoras generally lay their eggs on any flat smooth surface, which in the tank usually ends up being the glass.
Others catfish do other things, ranging from swimming around madly laying eggs everywhere, via male or female catching the eggs in the mouth and holding them there until they hatch all the way to cuckoo-breeding (parasitic) of the synodontis species, where they spawn in conjunction with the host, a mouth-brooding c-ichlid specie. The eggs will then hatch before the hosts eggs, and use the hosts eggs as food for the first stage.
5) how can i tell male from female?
Entirely dependant on the specie of catfish, and there are some 2500 or so species, ranging from Male is quite different, e.g.
to some that you can't tell apart until one of them lays eggs.
6) will different breeds mate?
Sometimes. If they are closely related, they may do.
7) are hybrids bad?
Absolutely.
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Mats