- Mar 19, 2008
i have a 65 gal 36x18x24 tank set up for about a month and a half and planted for 3 weeks. for lighting it has 3x39watt t5ho but i have reduced it to 2x39watt for 8 hrs per day due to green water. i attempted a 3 day blackout and the tank cleared but 1 day after the lights were back it was pea soup again. ive been getting mixed advice on what to do so any help is appreciated. the tank is moderately planted and i have added some fast growing plants but it doesnt seem to be helping. i was dosing ei for a 40-60 gal tank plus adding 3/4 tsp of gh booster at water changes. currently i have stopped dosing ei for the last week to try and get rid of green water with no effects. What is the cause of green water and how do i fix it.