What is this? Possible pest?

[Dtfnemo]

Hi guys, what is this growing on my hammer? Got the coral about a month ago, it was doing great but then that one and another hammer bought together started to shrink and look terrible.
I thought it was because we change light bulbs (t5)
I dip the corals with coral rx two weeks ago and immediately they looked better. I cleaned that stuff growing on them but today I notice they are growing again. Should I be concern?

Picture taken before dipping the coral. It looks healthier right now but still not perfect

 

[Crabs McJones]

Hi guys, what is this growing on my hammer? Got the coral about a month ago, it was doing great but then that one and another hammer bought together started to shrink and look terrible.
I thought it was because we change light bulbs (t5)
I dip the corals with coral rx two weeks ago and immediately they looked better. I cleaned that stuff growing on them but today I notice they are growing again. Should I be concern?

Picture taken before dipping the coral. It looks healthier right now but still not perfect

Any chance at a better picture with more white light?

 

[cloak]

What color are they? Are they hard or soft? They look like harmless Foraminiferans IMO.

 

[Dtfnemo]

Any chance at a better picture with more white light?

I'll take one now but we change bulbs to two blue plus and two actinic so the tank is pretty blue

 

[Tahoe61]

What color are they? Are they hard or soft? They look like harmless Foraminiferans IMO.

^This.

 

[Dtfnemo]

They are hard, they felt like vermid snails I think that's what they are called

 

[Dtfnemo]

Thank you!!! Yes I think that's what they are... Foraminiferans
[emoji16]

 

[atx100r]

Hello I have seen some of this popping up on my rock...it attaches at a very small spot on the base...I've been pulling it out as I see it...it almost feels like plastic...

 

[Maritimer]

That's Ulva, sometimes called sea-lettuce. Like most macro-algaes, it's beneficial unless it takes over.

~Bruce

 

[atx100r]

That's Ulva, sometimes called sea-lettuce. Like most macro-algaes, it's beneficial unless it takes over.

~Bruce

Thank you for the info...I'll keep it in check and perhaps put it in my refugium...