Help I've got a terrible Algae bloom going on after installing new bulbs. At first I thought it was temporary but it has not gone away for a month. I have a 72 gal bow front with 4 x 65w PC bulbs. I run my diatom filter on it almost nightly and it just comes back the next day. Last Saturday I changed 90% of the water and ran the diatom for for 5 hrs and it was crystal clear. I thought that was that. Nope. By Tues it I had a green tank once again. I might add this is an established, heavily planted tank since the year 2000.
What in God's name is going on here!