Coral Skeleton disolving?

[Raxnar]

Still very new and learning every day!

I have what believe is a Frogspawn? please correct me if I'm wrong.

One head recently fell off when I barley bumped the skeleton. It had maybe a few mm left of skeleton left so was able to glue it down and it seems ok so far. Pic 1.

Pic 2 and 3 show the other 2 heads and how diminished the skeleton has become under the heads. One is quite dark and hard to see.

Should I be worried about these heads? should I be proactive and break them off and glue them down elsewhere?

Any advice is appreciated!

I've highlighted as best I can the areas of concern with a red pen.

Pic 1:

Pic 2:

Pic 3:

 

[Gareth elliott]

That looks like bite marks to me. I would dip that coral again.

I would have 2 containers set up one your coral dip the other tank water (clear container)

After using your dip put in the second container and very gently blow on it with a turkey baster when done view from the bottom looking towards a light see what comes off.

 

[Raxnar]

When I first got them ~4 months ago they were dipped first day then 1 week later.

What would I be looking for?

I don't believe any of our fist are coral biters.
- Leopard Wrasse
- Green Chromis
- 2 Clowns
- 2 Cardinals
- 1 Green Spotted Mandarin
- 1 Red Dragonette
- 2 Azure Damsels
- 1 Royal Gramma
- 1 large emerald crab (about 3/4-1" across his back, closer to 3/4")
- assorted hermit crabs and snails.

There was a purple sponge around the back one near where the flesh starts but its receded.

 

[Gareth elliott]

There are some papers ive read on some sponges resulting in the downfall of corals. But no first hand experience with them.

What are your water parameters?

 

[Raxnar]

There are some papers ive read on some sponges resulting in the downfall of corals. But no first hand experience with them.

What are your water parameters?

Salinity - 33.5ppt (1.025)
PH - hovers around 8
Temp 26.1C
Alkalinity - 10.47
ammonia - 0 (Seneye says 0.005, so trace amounts)
Calcium - 462 (due to be rechecked)
Magnesium - 1440 (due to be rechecked)
Nitrate - 0.25
Nitrite - 0.001 (barely colour change to the test water)
Phosphate - 0.08

I am dosing NoPox, Aquaforest, Energy, Vitality, Amino's, Build, and Phyto.

I am also dosing Vibrate on a 2 week schedule currently. Have some bubble algae appearing that my emerald crab isn't finding so may up that to weekly.