I have to disagree with Boxermom on this issue.
There has been quite a bit of experimenting when it comes SAPs in captivity.
Some done by myself...
A SAP should be kept in a tank which measures around 15 US Gallons, (56-57 liters).
That does NOT mean that the tank volume needs to be raised exponentially when more SAPs are brought in.
10 SAPs = 150 US Gallons, or 568 liters; I think not...
180 liters is a fair sized tank for holding 4 SAPs.
Possible tankmates are plentiful.
I have kept small Chiclides, Neons, Platy, different kinds of catfish, different kinds of barbs and tetras.
Many choices... Few problems...
I had this tank active for quite some time:
Description:
A 90 gallon (350 liter) freshwater tank built into my living room wall. Rather heavily planted & decorated in order to make a semi-successful community tank containing 1 male and 2 Female Carinotetraodon irrubesco. Other fishes are a Pleco, 10+ Ancistrus, 8 SAE, 2 Mikrogeophagus ramirezi, 2 Indian Dwarf cats and 40+ Neons. Plants take some punishment from the everlasting hunt for (imaginary) snails. Small gravel as substrate. A select choice of roots are built together and attatched to a mahogany "frame" which is hidden under the gravel.
Specs: T5 lights, JBL500 outboard filter, Fluval 4+ inboard filter, a small powerhead for current.
Originally I kept 4 large SAPs as the Puffers of the tank.
Less violence than with the C. irrubesos.
The occational neon was eaten, but that is the name of the game.