My first puffer

[Eglinlotus]

So I've been searching my LFS's for the past few months for a true freshwater puffer (they always had figure 8's and called them freshwater but are brackish), and I came across a Asellus Puffer and did some research and found out that they are quit friendly with other fish. Is there anything else I should know about these little guys besides they need to eat snails to keep their teeth trimmed down. My tank is a 120 gallon duel over flow with a 400gph canister for with 4 48" T5 its a lightly planted tank with swords mainly and jungle vals. His tank mates are silver dollars, 3 polys, a brown knife and a black knife and some random medium size tetras(black skirts and diamonds). I've been feeding everyone sinking carnivore pellets hikari, frozen blood warms and beef heart.

 

[bottles]

These guys can and probably will nip other fishes fins, they just don't usually rip the other fish in half like some puffers. They are peaceful by puffer standards. These guys do best in groups. I think that the biggest problem is the polys. Colomesus Asellus usually come in at pretty small sizes and the polys (possibly the knifefish as well) may beat on them after lights out.
Nice looking tank, but this sounds like a dangerous combo.

 

[Eglinlotus]

My polys are no bigger than 7 inches in size and they leave my other fish alone. I have seen much weirder combos with polys. (i.e Rams) which are smaller than these puffers buy almost 2 inches when fully grown.

 

[Fat Homer]

Besides the possible fin nipping etc, you should also note that Asellus Puffers do still require regular teeth trimming even with constant hard shelled diets due to their extremely fast growing teeth...

So you may find the need to do manual teeth trimming...

 

[Pufferpunk]

A 7" Polypterus can easilly swallow a SAP, which will kill them both. In addition, it would be impossible to feed SAPs in a tank that size, considering they need 99% snails.