White/Gray tissues around corals

[hsnydn]

Hi,
I see some kind of tissues growing around the corals. I was ignoring however it started to bother the corals and it is about to cover on top of micromussa and hammer, so micromussa coral started to shrink. I removed corals out to check. I thought it is fungal or bacterial infection. However There was tiny holes on the tissue, and i was thinking it may be hitchhiker and manually removed the tissue by using blade and brush. Within 2 weeks, it started to cover the space as the same as before.
You guys have any knowledge about that. I need your suggestions.

Tank details:
Tank: 200L
Alk: 8.3
Cal: 420
Mg: 1410
Nitrate: 5ppmsince a month( it was around 50ppm, dropped to 5ppm within 2 months by using nopox)
Aquamaxx HOB 1.5 protein skimmer
Maxpect etheral 130W light
Dosing : alk, cal, nopox
Feeding: weekly 2 times with reed roids and Redsea Energy.

 

[Saltyreef]

Did all the frags come from the same supplier? Looks like some sort of sponge if its matted together and textured...but might be some sort of bacterial growth as well if its more slimey and snotty.

I would remove all frags and scrub it off in a container of tank water.
Possibly do a dip after.

 

[hsnydn]

Did all the frags come from the same supplier? Looks like some sort of sponge if its matted together and textured...but might be some sort of bacterial growth as well if its more slimey and snotty.

I would remove all frags and scrub it off in a container of tank water.
Possibly do a dip after

Not all but almost all of them from same supplier, but in different time period.
I did scrub and dip. Will do it again next week.

 

[hsnydn]

Which type dipping solution should i use? I have seachem dip( iodine) and coral rx.

 

[resortez]

Yea, definitely some type of sponge. Not sure if there’s a dip that will kill it off but sponges don’t like exposure to air. Dwarf angels like picking at sponges & are reef safe. Would also try Pygmy angels. Don’t quote me on this but emerald crabs might help too. Good luck