Everybody in my 30Gtall has lived seemingly very well the past 14 months. My tank is quite crowded per the experts, (6 serpae tetra, 5 neons, 3 dwf gouramie, 2 otto cinclus, 1 loach, and until last night, 1 big angel. I exchange 10 gallons every 2 weeks & feed a good pinch of the freedried food...