Help what is this?

[Z 2 L8ter]

This webbish looking stuff keeps growing all over plants and decorations in my tank. I removed everything from the tank twice, rinsed and scrubbed it all and vacummed all of the sand. Still this keeps coming back after a week or so. Can anyone tell me what it may be and how I can get rid of it for good? I don't think I overfeed or anything. Any help would be greatly appreciated!

[smaug]

Is this a fairly new tank?

[Z 2 L8ter]

The tank was set up in September 2008 so it has been up and running for 7 months or so. I've never had the problem until 3 weeks ago.

[smaug]

How long do you keep your lights on?And what wattage and type are they.

[Z 2 L8ter]

I leave the lights on about 10 hours a day or so. I'm not sure on the wattage at all. Whatever came with the kit haha. They are just regular lights.

[smaug]

Thats a long lighting cycle for a tank with no plants.You can easily just turn the lights on when you wish to obeserve the tank and leave them off the rest.

[Anomaly]

What's your feeding schedule like? Almost looks like the white mold that can form on uneaten fish food. You might want to try cutting the amount of food given to the fish.

[Red]

I agree, I think its uneaten food..

[Z 2 L8ter]

Thanks for help so far everyone, I was wondering if it was food but it really looks like my fish clean food up really well. I took all plants and decorations out today and cleaned them. It is almost like a slimey substance that clogged up my drain. I will keep lights off more and cut down on feeding and see what happens. Currently I only feed once a day.