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FriscoTX 01-08-2007 10:18 PM

Brown-Yellow Filth on Sand
I did a pwc yesterday and vacuumed the sand bed to get rid of this brownish yellow stuff growing on my sand. Can anyone tell me what it is and how to get rid of it long term?

Ammonia 0
Nitrite 0
Nitrate 0
Phosphate .3
PH 8.3
SG 1.025
Calcium 440

ezy33 01-08-2007 10:27 PM


melosu58 01-08-2007 10:48 PM

Is it dusty or slimey?

FriscoTX 01-09-2007 12:54 PM

It looks more dusty than slimy - i'll try to get a picture up later this eve

roka64 01-09-2007 01:14 PM

How old are your lights? What kind of clean up crew do you have?

FriscoTX 01-09-2007 01:17 PM

EDIT: lights 2 pwc 24watt, 1 actinic, 1 10k - it's a 2 month old bio cube
clean up crew is 4-5 hermits and 4-5 snails, i can't remember since I bought it as a "clean-up crew" from the lfs

roka64 01-09-2007 01:20 PM

It sounds like diatoms, but a pic would help.

melosu58 01-09-2007 02:42 PM


Originally Posted by roka64
It sounds like diatoms

This would be my guess also.

loyalrogue 01-09-2007 03:03 PM

Well now that the veterans have agreed, I'll be bold and say that it sure sounds like brown and golden diatoms to me too. :wink:

What kind of sand did you use to start your tank?
Diatoms like silicates.
If there's a source of silicates in your tank (sometimes from sand, water, or salt) you'll have to remove it.
Other than that you can starve it just like other types of algae or cyano.
Reduce your lighting period, and reduce the excess nutrients in your tank.

FriscoTX 01-09-2007 09:33 PM

Here's a picture - Do I have any excess nutrients? Unless you count po4 which is still on the low end, I would think my nutrients are good. Is 48 watts and a 10.5 hour daytime schedule too much light? Also I have the outflow pointed up to maximise surface movement, should I have the outflow directed at the reef itself? That could create more flow down at the base - just a thought.

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