I have a 750 litre tank with a refrugium. I have had tropical fish 15 years ago but not corals. I have 1 anenome, I had 2 but one went through the power head. The other has never been that great either, it doesn't seem to want to eat and looks pretty sad. The clowns ignore it. I have 3 clowns so far and a bi-coloured Blennie. I test for everything regularly. No problems with that and the tank is still in the green algae stage at about 4 months old. I want to have about 20 fish and Im adding them slowly.