Twelve different food types for about 35 small fish in one nano and one 55 bow front. Add one 20 tall. Doing a soft water tank with R.O. for Blue Rams. I had them ages ago before water changes were done regularly and have been lusting Rams after watching Dean's Fish Room, but never thought I could keep them. Got a pair going now that I have managed to keep alive for a month, so far so good. I've had R.O. for many years but never had fish tanks to use it on.