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Cultivated Reef

What causes diatoms to re-grow?


cuteios

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Ok so I thought I was through my diatom bloom...but I just noticed that there seems to have been an increase in diatom cover in my tank since I took the pictures. I was monitoring the drop off...but it seems it has come back. What gives? I don't know where to start looking for the cause of the new bloom. Could someone shed some light on this pesky little condition.

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Phosphate buildup from overfeeding will do it. Try reducing the amount of food you provide. Just enough so its all gone in maybe a minute or less. You could also try to reduce phosphate by running something like Seachem's PhosGuard or SeaGel.

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MrConclusion

Reducing the phosphates will definitely help. PhosGuard is a great product because it also absorbs silicates, which encourage nuisance organisms, too.

 

I would put approximately 1 heaping tablespoon of PhosGuard in a high flow area, then replace it after 3-5 days with a fresh dose of the same size. Then you can cut back to replacing it every 2-4 months.

 

This works great in my nanos. I use RO/DI water but I don't have a HI-S membrane, so my water comes out of the RO unit with significant silicate content. Also, many fish foods are a steady but slow source of phosphates.

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Thanks for the info guys. I don't have a fish in there right now, it's technically still cycling. There was a blue damsel in there about 2 or so weeks ago but I found him rug surfing when I came home one night. I use RO water for top off too...I'm not sure if the place I buy it from has a HI-S membrande on there filtration system though.

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