Hopefully someone can help me with these problems. After a 4 day blackout the tank looked perfect, but within a week the water turned hazy again, as though someone had spilled milk in the water. In only a few days the algae returned, which is a green dusting over horizontal surfaces, but suprisingly the glass has remained completely algae-free, much to my surprize.
Tank parameters are: 29 gal, 10 hr photoperiod w/55 watt Brite Kit 4" above water;
N-30, P-2.5, Fe-0.3, macros and traces (plus Excel carbon) dosed every other day;
Pressurized CO2, drop checker green, ph drops .4 during the day, bubble counter
w/mineral oil @ 1 1/2 bubbles/sec
As far as the algae is concerned, my only guess is that it might be due to CO2 fluctuation, as the glass diffuser is directly underneath the HOB filter, the flow of which decreases slightly several days after weekly tank maintenance and gravel vacuuming. However, I have no clue about the hazy water. Unable to find any dead fish that might be rotting away somewhere on the bottom.
Tank is heavily planted, including wisteria, which sucks up nitrate like there's no tomorro. Thanks for any responses.