Rock erupting sand + another.

[Anonymous]

The first is an occurrence that I hope isn't a bad thing. On one of my rocks there is a small hole which I have observed what look like small grains of sand getting ejected up into the water. Possibly eggs of some kind?

The second is in the pic. The base is not soft, but felt somewhat hard the last time I did a water change. Whatever it is it has clear tentacles which I have observed grabbing a flake of food as it floated into it. It has yet to move from it's location on the rock.

 

[Anonymous]

Whats the deal? Pic not good enough? I'll do my best to get a better one.

 

[glaze]

aiptasia -- very bad. they multiply and sting everything. If you scrape it, the fragments each grows up.

 

[Anonymous]

sorry,glaze-
but those are NOT aptasia.aptasia do not have any calcareous skeleton, but are an anemone.these are coral polyps.

musicsmaker-
what you have there is a type of coral-and a relatively common hitchiker. i've seen them often on lr(clear tentacles, usually)-forget their name, but they are nothing to worry about. 8) (they will not move from their location, for they are 'cemented' in place-but they may 'bud off' and it's possible that new polyps may settle out onto your rock as they reproduce-they stay as a solitary polyp-sometimes grouped together, as in your pic. i've seen pics of them in quite a few books-try books on coral i.d.-just wish i could remember what they're called

The first is an occurrence that I hope isn't a bad thing. On one of my rocks there is a small hole which I have observed what look like small grains of sand getting ejected up into the water. Possibly eggs of some kind?

most likely detritus from either a worm, or small crab.do you see a 'pile' of stuff below the hole, either directly, or on the substrate?-also probly nothing to lose sleep over :wink:

hth

 

[SteveC1]

A type of cup coral. I only know this because I just ID'd them on my own rock. Rhyzangiidae family, probably Phyllangia sp. or Astrangia sp. See Borneman's book, p. 321. HTH!