I've had an 8 Gallon Biocube for about 4 months now. I have one snail, one hermit and two ocellaris clown fish. About a month or so ago my tank started getting absolutely dominated by green and red diatoms/cyano bacteria. I've dosed the tank with chemiclean 5 times following the directions to the tee(wait 48 hours then 25% water change) with absolutely no results. I can't seem to get rid of this bacteria and it makes my tank look like a cess pool. Also, the rate the bacteria comes back(significantly) after cleaning is around only 2 days. Very frustrated, please help.

Additional info on the tank: 1.025 salinity, Temperature around 72 degrees(I know thats a little low), stock filter pads with carbon still inside, second chamber contains bio balls, Tank light on timer for 6 hours of daylight and deep sandbed.

Cut down your lighting and add macro algaes.

my .02

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fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden

u think 5 hours will do the trick?

In my tanks with macro algae there already (in a refugium usually) I kill the lights for a few days then resume with less lighting. and increase the lights if the cyano/algae does not come back and decrease if it does.

At some point you should be able to get the macros to grow and keep cyano/algae at bay.

5 hours sure is a starting point. then make adjustments as necessary.

And try feeding less as well.


my .02

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fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden