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Im not sure, is this right place to this topic, but... My other intrest in aquarium hobby is crabs and my question is, what species i can keep in 20-40-liter tanks? I think that theres no many species, but i have to ask.

is this what species can go in this size tank with the crabs? If yes, what species are the crabs?

Two little tanks, size about 30-liter Cherry shrimps and Rili shrimps. I have one bigger tank there live Procambarus sp., but i dont know can i put fish to this tank? Sorry about my first message, it was short and contain no information?

Otos or dwarf Cories would be the only possibilities AFAIK.
Your tank is about 8 US gallons ?
C hastatus, pygmaeus or habrosus
are the only Cories that might work.

I have habrosus in with my RCS and they do great

Ok, thanks! Have think those corys, good that some species can kept in this size tank.

I have 3 oto and 5 C. habrosus in a 30 cm ADA cube and they're very happy in there. I don't plan any other fish (I did have some CPD's but most of them have jumped out), but will add some shrimp.

if you got tanks at room temperature and you use a good pump or a diffusor, is a possibility too.

if the tank is heated.

Thanks for your help! I bought little group C.pygmaeus and they are very nice!

Our work here is done!

Jools

a bit too late, but i heard that the presence of Corydoras slows down the breeding process of many (dwarf) shrimp species.

I haven't tested this myself though...

Thanks for the info DutchFry! I have to watch how they go.