diatoms, cyano or dino?

[unknown_element]

Tank is 2 months old, LFS recommended chemiclean. I used it, did a water change looked good for a week now its back. I have been using ro water from the Walmart fill your own station that I read is bad today. Levels are good,ca and kh low but going to start using tropic Marin.
PH 8.2
Ammonia 0
Nitrate 0
Nitrite 0
Ca 350
Kh 9.2
Mg 1360

I might be worrying for no reason, but don't want something to get out of control. One of the rocks towards the top has trapped bubbles but that's the only one. I have 2 fish and 6 corals doing great, also am running beam works led.
Please help me out! Thank you for your time!

 

[jman9331]

from your last picture is it growing on the sand?

 

[unknown_element]

Yes. In a few spots.

 

[jman9331]

looks like dino to me, a good friend of mine had this problem as well. What he did was cut the lights off for 3 days, siphoned out as much of it as he could and raised his PH level to about 8.4-8.5. This worked for him, someone else might have a better idea, but this is one way.

 

[DFW]

If it looked good after the chemiclean treatment then it must be cyano. It would not remove dinoflagellates even temporarily. You need to use ro/di water of a good quality! Do another chemiclean treatment, and then run a skimmer to get the residual junk out of the water in addition to the 20% water change. It is normal to have to do back to back treatments sometimes. Siphoning out what you can before treatment is good, too!

 

[Libimagana]

I have the same problem but I think mine is cyano bacteria
Only thing is growing on my corals and my anemone I had to speed up the circulation because my anemone would close don't know what to do [emoji30]