<a href=showthread.php?s=&postid=11878018#post11878018 target=_blank>Originally posted</a> by firefish2020
Frequency of water changes (be honest)
Or how long have you been doing weekly 10-15 gallon changes and what was your schedule before?

If you've only recently increased the amount/frequency of water changes keep them up. I'd be tempted to do at least 20 gallons weekly for now. Blow off your rocks and stir the tank up good before your water change. Remove as much hair algae manually as you can too.
feed small amounts 2 to 3 x dailey
Unless you're keeping fish that
require frequent feedings like anthias or juvenile chromis cut your feedings to daily or no more than 2x a day for now. Trust me they aren't really starving
What are you feeding? If you're feeding flake it's usually loaded with phosphates. Try a high quality frozen or at least a good pellet if such a thing exists now that vibro-gro is gone.
protien skimmer is coralife venture for 220 gal
How much skimmate are you getting from it daily/weekly. Can you adjust it to get more?
Basically you're importing more nutrients...phosphates than you're exporting. Or the rock is loaded with phosphates and its leaching it back out. Depending on it's age and maintenance your sand could be a problem. Do you do anything to your sand bed at all? Stir, siphon etc.? A phosphate reactor would probably help but you need to fix the underlying problem.
I'd also like to know how much flow you've got?
I'm one that doesn't believe old bulbs cause algae

but they can encourage it's growth if excessive nutrients (PO4) are present.
Personal experience...last year my 6 year old bare bottom 20 gal had a massive hair algae bloom for the first time ever. My father had some medical problems and I really slacked on water changes and general maintenance in this tank for a few months. When the tank "tanked" so to speak the PCs were ~10 months old. Started basting the rocks daily and resumed weekly water changes and detritus siphoning but bumped them up from 2 gallons to 5-10. Yes Ron I
really did weekly changes on the nanos at the time
Kept the skimmer running as wet as I could, its a sea-clone :lol:.
After ~ 4-5 weeks the algae melted away even with old bulbs.