REEF2REEF Saltwater and Reef Aquarium Forum
Color would suggest #chrysophytes (which are diatom-like in some ways), but the photo still doesn't have enough detail to say for sure.
Diatoms should also not look green....is that color in the photo real?
If you can, I'd like to also see results of a "shake test" for confirmation. (lots of details for testing on the dino sticky thread...even for cyano too)
Put a sample in a vial, shake it up to homogenize it....leave it alone (ideally under a light) and see if it regroups in a mass or if it stays shaken up. Dino's are the only common thing that will regroup. Cyano or diatoms will not.
Try the search of this thread I put at the end of this line and look at more than 500 posts worth of metro attempts, not one of which ended in a dino-free, side-effect free tank at the end: metro
IMO, make your current metro dose your last and keep reading!
To make the current strategy even worse...
Your bloom looks more like chrysophytes than dino's to me.
But maybe another pic might look different. BTW, you can get a $12 toy microscope (what I have!) and get some great cell phone pics with it if you don't mind holding off further "treatment" until you get a more positive ID.
In the mean time, I'd suggest starting to search on #chrysophytes. @taricha , @reeferfoxx what's your take? Dino's, or...?
Also even though your stuff doesn't look like dino's IMO there's a good chance the treatment situation will be the same or similar.
I would think of this cyano like your tank is going through another cycle just like at the beginning....only this time it's processing a much larger nutrient load. So give this the same kind of timeframe for the tank to "get past it"....at least 4+ weeks IMO. Just a case of the uglies now!
If that's dino's, there has to be something about your process that's provoking this situation for it to be such a consistent outcome on different tanks, IMO.
But, generally, it seems like they respond similarly to other harmful algae blooms to a correction of the environment and nutrients. So fix any contributing factors you can fix, including dosing liquid nutrients in the short term, if necessary. And otherwise stabilize the presence of dissolved nutrients until the tank turns around.
Also, Brandon's quote up there is on the old side now – we're amassing new information on these topics daily, so it's not really fair quoting him from then.
Chrysophytes are most certianly nutrient driven just like every other critter in the microbial food web, they could be a normal background component of most healthy reefs.
And mine seemed happy "eating" my Hydnophora during the peak of my bloom. I didn't let them take my tank down, but it seemed to be heading that way. That coral went from the size of a dinner plate to almost nothing. Even after this much recovery time, the largest pieces of regrowth are only about the size of a quarter.
If you haven't already read the Dino thread* and/or the Nitrate dosing thread, now would be a good time for it! Likewise for this post on my blog: A Nitrate Dosing Calculator For Better Tank Health (And Better Coral Color!) Maybe check out any posts that got tagged with #chrysophytes
Your tank needs a steady nitrogen source and a stable phosphorus supply. Tanks like yours and mine that get ignored probably have not had a bulletproof record on either side of that equation.
I hope this helps! You're welcome to PM me or post here with more questions!
*Just go to that thread for the background info and photo ID's that so many folks have posted. None of the chemical-based "possible cures" the thread drags you through actually work. In the end you've got to restore a normal nutrient balance.
- Chrysophytes, AKA "Golden Algae" - How to identify, treat and remove it from your tank!, Apr 7, 2017
Sounds like it's about gone then, eh? Love it!!! Great pics and movies too.
If you can post them, I was curious about the details of any nitrate dosing you tried. (Dose rate, observations you made along the way....anything/everything.)
KNO3 worked on mine and from what I've been able to read, there's no reason to expect that it would work less well on other chrysophytes.
(Look for my posts and pics in my Member's Tanks thread, the Potassium Nitrate thread, the Dino thread, as well as one of the Diatom threads I think...and my posts tagged #chrysophytes. LOL...it was an adventure.
But I'm now happily tending a crop of plain-looking cyano and a little bit of green hair algae while some of the coraline algae grows back. The Hydnophora has almost doubled in size (from almost nothing left). In fact all my corals have been growing like crazy since. NO MORE CHRYSOPHYTES.