Marine Aquariums

Cobwebs on live rock?

Question:

 

Good Morning Tony,
 
I’m not sure if you’re the correct person to ask but I can’t find an answer for this.
 
My tank is 320 litre and been set up for almost 5 months, all the levels, PH, Ammonia, Nitrates, Nitrites & salinity etc is spot on, which I check regularly.
 
However, recently I have been seeing a cobweb like substance covering the power heads, heater and live rocks; it’s been like this for a week now and doesn’t appear to be affecting the fish, the hermits or anything else.
 
I‘ve got in the tank:
 
30 kilos of live rock
5 chromis
1 tank bred clown fish
2 gobys
2 feather duster worms
15-20 hermit crabs
2 sand sifter star fish
3 emerald crabs
2 shrimp
2 turbo snails
 
I’ve got the brown algae which seems to be disappearing now and everything seems healthy enough and has done for a while. People on the internet forums say its sandworms, webs made from the turbo snails, vomit from the live rocks or vomit from the feather duster worms but I cannot find a definitive answer.
 
My only concern is that it will not harm the tanks cycle and everything in the tank, I suppose without a picture you wouldn’t know what it is but from your knowledge, have you heard of this cobweb like substance?
 
Best Regards
Andy


Answer:

Hi Andy
 
The web like substance could be due to a few things including bacterial mulm but in your case
it sounds as if the webs are being cast by vermetid snails.
 
See the following online article for more info:
 
They are quite harmless so no need to worry.
 
regards Tony
 
 
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