2/4/2015
Okay long update has been overdue. This little blurb is about
Hair Algae and
Digitate Hydroids The digitate hydroids were a pest and did irritate some of my zoas.
I had a seemingly unbeatable hair algae outbreak that resulted from nothing. My water parameters were perfect Close to 0 Nitrates Close to 0 Phosphates. My system was and is running super low nutrients.
I definitely had hair algae, not derbesia not bryopsis. I had a yellow tang that wouldn't eat it. Turbo snails didn't eat it. Emerald Crab didn't eat it. The only two things that I saw eat the hair algae were a Sea Hare and a Hectors Goby. Both of which are known to eat filamentis algae. The sea hare died shortly after eating it (maybe from old age). The hectors goby couldn't keep up with the hair algae growth rate in my 40 breeder. I needed at least 5 of them to be effective.
It got bad. I have no pictures and I was ashamed to even show my tank.
I was at the breaking point and considered replacing all of my live rock with "Real Reef Synthetic Rock" because I thought maybe my rocks were leaching nutrients. But that would by my final resolution.
I found a thread on Reef Central about API Algae Fix Marine. It had about 80 pages of people in my situation claiming it had removed their hair algae. I followed the dosing scheme of 1 dose every 3 days for a total of 11 doses. At the 2nd dose, I notice the hair algae becoming white and falling off the rocks.
There's a reason why hobbyists recommend stopping after the 10th dose, although API Algae Fix says its invert and coral safe. It's simply not. You're dosing an algaecide into your tank. I personally believe it harms the zooxanthellae in corals to an extent. I lost 3 mini colonies of zoas (RIP Fruit Loops) immediately after dosing, my acans looked like they had colorless holes in their flesh, and some snails died. All corals recovered after dosing.
I used Algae Fix in combination with big water changes (30-50% every week). I also removed as much of the hair algae from my tank as possible.
The digitate hydroids disappeared. No clue what could have gotten rid of them, but I haven't seen a single swaying strand in months. The hair algae is down to short nubs a couple millimeters tall. I added 20 more blue-legged hermit crabs which seem to help.