Bubble on live rock

[chefrt1]

For the past 2-week 1 see a lot of bubble on my live rock and the rock turn brown in color. Is this bad new for my tank? The bubble mostly on the middle and back of the tank at the top layer and also at the back glass, in the front I don’t see any bubble. Is this bubble to show that the starting point symptom of bubble algae. I do water change 20% every month.

 

[Len]

It might be dinoflagellates. They are brownish, slimey algae that form bubbles. To reduce dinos, make sure your water is well oxygenated and well circulated. A protein skimmer helps. Higher pH and alk also helps (drip kalkwasser). Or it could be diatoms and air bubbles that happen to both occur in the same area. Diatoms grow with higher nutrients and silicates. If your top-off water, mix water, or salt mix is high in silicates, it can encourage diatom growth.

Neither of these are bubble algae (valonia).

 

[chefrt1]

May be you right, I think my water circulation is not very strong especially at the middle and back of my tank, since I change the power head position. My protein skimmer do a very good job, I have to clean it on every 2 days. For my top-off water, I used RO water and for water change I used FSW.
I happy to hear this is not a bubble algae symptom

 

[Len]

If it is bubble algae, Emerald crabs usually work well to get them. But bubble algae is very easy to identify (as green translucent bubbles).

 

[pcardone]

increase your water flow, use a toothbrush on the algae and do a water change. the tank should work itself out.