36l is abit small for those 3 Si, keep it clean thou and they should be ok. Might want to go for a bigger tank eventually mind! The purists will tell you 70l per FISH is what you need, but I think it's a little extreme. I have 5 Orandas an a Black Moor in a 150l (I think, I forget) tank, I hoover the gravel once a week and do about 20% water changes mid week and there really healthy, happy and are growing at a massive rate! When there young you can usually get away with smaller tanks for a year or so. Still, slap some pictures up! What cat fish is it? After 2 days of being in his new home, Boris is settled well, eating, basking, shitting, doing everything a bearded dragon should do! So, I give you, Boris the 11 week old Beardy! He's quite the character! Quite fun to watch.