So last night was my monthly aquarium club meeting and every month we have a speaker. This month was about proper filtration for your tanks. The speaker is a pretty big importer of fish in Honolulu and he was saying that........ Down the line, about 6 months and IF you have the proper biological media(like Biohome Ultimate) and you grow the anaerobic bacteria your water parameters should be..... Ammonia- o Nitrite- 0 Nitrate- 0 I thought that you should always have some nitrates in your water? Now I can see if you have a 20 gallon tank and only 2 small guppies in it the parameters would be triple 0's, but in a moderately/heavily stocked tank and doing weekly water changes and the tank being fully cycled and with the right biological media, Can you have triple 0 readings and have a healthy tank? Edit: the tank the speaker has are NOT planted tanks, his tanks are mostly bare bottom and some with fulval stratum and a plant here and there, but not your regular planted tank.