Sisterlimonpot
Premium Member
I have a 40 gallon reef tank that had been doing very well for around six years. Then about a year ago I started getting some green hairy algae growing all over the live rock, then over the corals, pretty much everything. I tried massive water changes, scrubbed algae off the rocks, phosphate control and eventually decided to pull and toss all the live rock and corals since the algae was clearly not going away and covered everything.
With my tank empty, except for 3 fish and some hermit crabs, I installed a fluval cannister filter, put in some fresh live rock, continued frequent water changes and boom the new live rock is again covered in green hairy algae... how do I get this stuff to **** off? I've changed power compact bulbs, should I change out some/all live sand? what next? see photos...
[welcome]
Hair algae grows when you have excess nutrients in the tank, (i.e. nitrates and phosphates) Do a search on how to reduce them, There are many ways to do it, I prefer vodka dosing (which would have worked for your 6 year old tank, but since you killed everything off I wouldn't recommend it on the newer tank). But there are plenty others out there that will help.