ok i have another thread but the topic has totally changed. I have 2 tanks. one is brand new and being setup. other tank was a 10 gallon which has alot of communal fish, but i made the mistake of adding 4 Dwarf puffers only to find out they are not very friendly. Now i was gonna put the 4 DPs and maybe 2 albino cory catfish in the 20 gallon. Is this an excessive size for those little puffers?