Idk what to do about this GHA

[Eddie7144]

Help me out here guys. I have a 150 mixed reef, do 30 gal RODI water changes every week. Tank been running for 6 years. Hannah checker reads 0 PO4 and 0 no. Yet I have a patch of gha that won't die off actually growing lol. Obviously my point can't be at 0. I run phosguard use rodi water feed 1 cube of frozen food a day . Only have 4 fish 3 clowns and 1 labouti wrasse. How can I get control of my phosphate?

 

[TheStrangler]

I'm in a similar boat where my phosphate and nitrate levels are undetectable with Hannah Checkers, but I still have algae. Just meaning that I do have phosphate/nitrate and its swiftly being soaked up by the algae to show zeros on the test. I'm fairly adverse to the concept of dosing or using anything other than manual or natural treatments in my tank, so I'm giving an algae scrubber a shot. I haven't had any results (as its not set up yet) but the concept of just giving your algae a more favorable and controlled place to grow so that it outcompetes the growth elsewhere seems pretty solid. Just a thought.

 

[Eddie7144]

I'm in a similar boat where my phosphate and nitrate levels are undetectable with Hannah Checkers, but I still have algae. Just meaning that I do have phosphate/nitrate and its swiftly being soaked up by the algae to show zeros on the test. I'm fairly adverse to the concept of dosing or using anything other than manual or natural treatments in my tank, so I'm giving an algae scrubber a shot. I haven't had any results (as its not set up yet) but the concept of just giving your algae a more favorable and controlled place to grow so that it outcompetes the growth elsewhere seems pretty solid. Just a thought.

Heard good things about those, just make sure you size it right.