My honest opinion: I wouldn't try it; it sounds very disgusting. Theres already enough harmful stuff in an aquarium without putting rabbit crap in there too.
and rabbit poo is soooooooooo stinky...![]()
Gimme rootabs any day...![]()
The first pass poo is most definately squishy.
Then they eat it and get out what they missed before and it comes out pellet like
I can't se a problem as long as you know exactly what the rabbits have been eating. Tame ones would be best of course as you have control over their diet.
AC