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Thinking of buying submersible uv na expose un light then ilagay ko sa display tank ko para un algae dun mamatay.. Ano effect nito sa fish?

@engrchun if algae is an issue, it means you have elevated nutrient levels. If phosphate is too high, in your case I would just use a GFO instead of UV. Address the cause, not the symptom.

PS

You don't even have to put it in a reactor, just put it in a nylon mesh bag and hang it in your sump.

How does gfo looks like?