I found a great site last nite.. this guy says he keeps about 2 per gallon. He has even bred them and everything! Great site for ANYONE with
ADF. He has a guide of how many
ADF per each common tank size, and all kinds of great info!
http://davidcecere.pipidae.org/
oops.. I was a lil off.. here is the chart if anyone would like it!!
Algae eating fishes are not included in this calculation. This rule is an unspecified one. However, for ADCFs the area of the bottom of the tank is more important than the volume of the tank. In my experience I can offer you the following data for the stocking density for African Dwarf Clawed Frog tanks (without fish) that are appropriate when the points under tank setup are considered. These calculations consider the faeces, water quality and social stress for the animals.
12l tank (3 gallons): in my opinion inadequate for ADCFs, but a maximum of two frogs
25l tank (6 gallons): four frogs
40l tank (11 gallons): six or seven frogs
54l tank (14 gallons): eight or ten frogs
100l tank (26 gallons): 14 or 18 frogs