Hi, I wonder if anyone can help me. I've got a red tail black shark about 4" long and wondered if its possible to put a couple of figure eight puffer fish in a 24" aquarium with him

Puffer fish can be really aggressive, so i wouldn't keep 2 together, they can be terrible bullys and fin nippers and ideally would probably be best kept on their own. Red tailed sharks are also known to be aggressive so the 2 together could spell serious trouble.
I don't have any puffers myself but a friend does and has 3 tanks with one in each.
I have kept a red tailed shark in a community tank with no problems at all, but i think this was more the exception

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Paula
Grifdegalles

i used to have a mbu puffer, he was never aggresive to any other fish!

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http://cakiesbsh.webs.com/

You must have got one of the nice ones

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Paula
Grifdegalles

i wouldn't really risk it to be honest, you can get one in a hundred that will be really placcid and not bother with other fish but it's very unlikely. Puffers tend to do best on their own.

I have kept many types of puffers in the past and in my opinion it is best to keep them in species specific tanks as they are nippy.

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