[peterl23454]

ok... someone mentioned if i do not have enough light i will have a thick layer on the bottom. i think mine is a heavy dusting on the bottom. if the phyto crashes will it smell? will all the green "fall out " of the water column? i think with 2 20w bulbs i should be good. with double the average light used will mine reach max densistty before 3 weeks? how do others measure density? guessing game based on color? the first batch i split i am going to try no fert. to try and use up whats in there. sound good?