hi, yesterday i put my 12 fish in a 22g and just put the light on for the first time, everything is looking fine and the fish are enjoying there new spacious tank.. i was told my 50watt heater would be fine and it does seem to be doing the job but my heat does vary from 75-80 where as in my old 10g it was a steady 80. Also another question.. is my fluval 1 + hydor both in one corner enough for the tanks filteration system? thanks