Favia Stressing me out

[TroutWithLegs]

Took a look at the tank tonight before I am away on a work trip and noticed some of my colonies showing some issues. Most are favia/favities. Not 100% what the orange one is, not worrying about and ID just help with a diagnosis.

Haven't made any drastic changes to the tank lighting, temperature, or water makeup recently. Did a 5gal water change about 5 days ago following a trip to the coral store.

Parameters have been steady, pH steady at 8.1-8.2, PO4 consistent around 0.04, NH3 consistent between 0.2 and 0.5, Alk and Ca are normal.

I've dealt with some outbreaks of brown jelly in with previous tanks, but don't suspect it this time. As a little gut check though today I gave the affected colonies about 5 minutes in an iodine bath.

Anyone have any thoughts on what could be the root cause of this issue, and ways to treat, or prevent similar issues in the future? Thanks

 

[Pod_01]

Just observation, the PO4 seems low….. Also what does normal Alk level mean?

Anyways as a reference here are my value and couple of Favia pictures:

From your pictures the Favia look malnourished. Do you feed your corals? Corals do need to eat, they are very capable food hunters. Light alone is not enough…


Good luck.

 

[mermaid_life]

Looks like you have dinos or cyano... Can't tell for sure from the pics. Whatever it is, it's probably irritating the corals.

 

[EeyoreIsMySpiritAnimal]

Phosphate and nitrate are too low for LPS. As mentioned above, they are malnourished. Dirty up the water a bit and see if that helps.

 

[Whey]

looks like dinos to me man

 

[merkmerk73]

I see a lil aiptasia polyp in that first pic

I'd be more worried about that