Quote:
Originally posted by upin
I've been running this remote deep sand bed for about 2 months, and i notice that a great proportion of the top sand turns into greyish dark colour. Originally the sand was white. However, the bottom part of the sand remain white. I was able to see this because i put the sand on a square aquarium and locate it beside my sump. Is this discoloration because the phosphate binding thing? Hopefully someone in this thread could help me.
Thanks,
Kelvin
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Kelvin, are you blocking all light to the RDSB?
You need to do this to prevent any algae from growing in it.
Also, you need to make sure the flow going through the container is fast enough to prevent detritus from settling on the sand and breaking down.
Sounds like you might have both issues.