That looks like cyanobacteria. Reduce nutriment, do water change and syphon out as much as you can and put ferric oxide in your filtration or skimmer.
You can also try to reduce the lighting period until it receade.
What are your nitrates and phosphates? You probably have a lot of dissolved organic in the tank and syphoning the sand and doing water change will help.
Red Slime Remover can help but it is just a quick fix and if the reasons for the cyano are not taken car of, it will return stronger.
You probably have a lot of dissolved organic trapped in your sand and syphoning that out will help.
Quote:
Originally Posted by Capt_kulafu
please see and check my problem on my tank!!
thanks
fish 2.jpg - that's my filter (left) coralia (center) and skimmer (right)
fish 3.jpg - that's my problem right know!!
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