Mystery white substance growing in my tank

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Drewbeard57

My 20 gallon tank is plumbed and looking really sharp. I keep the lights off because I have a single clown in there keeping my tank running while I put the finishing touches on it. Out of nowhere this white spiderweb of stuff starts growing in my tank!
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The lights are on the show the substance but the tank is dark 23.5 hours out of the day.

At first I thought it was from my long spine urchin that I had so I got rid of him. Then I thought it was bacterial like cyano but I'm at a loss now and want some answers!

I do not believe it is an algae at all. There is no light. I feed one pellet at a time to my fish and I run phosphate media on the tank suitable for a tank twice the volume. Needless to say my phosphates are in check.

Any guess is as good as mine!


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Possibly but I can't find any signs of a critter like that besides the web like substance. And I have zero coral and I inspect everything I put into the tank carefully. That doesn't mean an egg or something didn't sneak in somehow though.


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These little guys are tiny. Full grown maybe about 1/4" tall most of the time they hide in the rock work.


Sent from pay phone in the airport.
 
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