Is this a case of vermetid snails?

[digitalabyss]

Is this a case of vermetid snails? The pictures I have found online seem to show more individual strands rather than a mesh over everything. This is my roommates tank. The only fish in it are 2 clown fish. It was setup about 2 months ago. There are also a lot of bubbles under the webbing.

 

[bang guy]

That looks like a bacterial mat to me, not Vermetid Snails. This can happen with an undersized skimmer and/or excessive feeding.

 

[digitalabyss]

hmm... I am pretty sure over feeding is not a problem. Via the instructions from the fish store he is only feeling them what looks like a pin head size of food. Its only two clown fish and some live rock at the moment.
His filter is a marineland C-360 that is rated for a 100gal tank and he only has a 45 or 50 gallon tank. Unless its part of the filter their is no dedicated skimmer.

 

[bang guy]

Another possibility is if ammonia was allowed to get too high it could have killed off the rock infauna leaving a lot of organic material rotting inside the rock.