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Old 02-06-2003, 06:20 PM   #1
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light film of dust or powder on top of water in tank ?

tried to soak it up w/ paper towels didn't work. could be dust from crushed coral on bottom of tank. skimmer doesn't touch it.any hints would help thanx
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Old 02-06-2003, 06:27 PM   #2
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Is this a new set up? It could be boyuant dust from new crushed coral, or if it looks like an oily film it is most likely DOC (dissolved organic compound. If it's dust, you should be able to skim it off by putting a cup barely below the surface so it pulls the surface water, dump it and do it again. If it's DOC, the same can be done, but it is a stop gap measure, cause it's gonna come back. For doc, you can redirect it with good water flow, but it will still be there. The only permanant solution for the DOC film is a surface skimming overflow box to a sump. This will pull it from the surface and mix it with the water so it can be pulled out by the skimmer.
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Old 02-06-2003, 06:35 PM   #3
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i have a skimmer box to the sump.its not pulling it in . I feed mostly flake food .i fed my anenome a silver side the other day .but it eat it ill try the cup trick thank you very much.
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Old 02-06-2003, 06:37 PM   #4
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its not to new I combined two exsisting tank to make one new one. but both where running for about a year
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Old 02-06-2003, 06:38 PM   #5
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If you are using an external overflow box, raise the box that is inside the tank, so the water has to fall in the box.
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Old 02-06-2003, 06:51 PM   #6
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do you mean lower the box inside the tank?the vents on the box .the water is up to the middle. the center of the vents make any sence? the guy at the pet store says i should buy power heads 2 of them. for the film
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Old 02-08-2003, 04:17 PM   #7
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i had that in my tank when i first got started and it was because i didn't have enough circulation. your circulation should be about 10x your tank volume per hour. like reefrunner said this will mix up the DOC from the top of the water giving your skimmer a chance to remove it from the water.
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Old 02-09-2003, 02:49 PM   #8
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Do you have a spray bar for the return? is it breaking the surface enough or is it underwater(the spray bar)?
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Old 02-09-2003, 04:40 PM   #9
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I dont know what a spray bar is . I just bought apower head today Ill see what that does.
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Old 02-09-2003, 06:14 PM   #10
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A spray bar is a long tube that is capped at one end. Along the lenght of the tube are holes. This tube attaches to a Powerhead or a pump of some sort.

This film is usually caused by low surface movement. Having an surface overflow usually helps but maybe your total water flow in the tank is to low.

What kind of pump are you using on your sump and what is your head height. Also whats the total size of your tank?
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