2 small Senegal's and one african ropes at the moment all fairly small bought same time and place so they are in comunity quarantine in a 20l I was trying out sand in, i am setting up a 75 this week end for them, still trying to iron out the filtration and if I am going with seachem black fluorite or a soft sand substrate, so at the very least I will have a sponge in a 75 gallon seeding the hardscape this week end.