in my 80 gallon I am running 8 bags of activated carbon and 500ml of purigen to help with the algae and water clarity, you could even use some polishing pads as well.
what size filter are you running in that 30 gallon?
in my 10 gallon nano I am running a fluval 404, which is way overkill but it really makes a difference, same with my 80 gallon I am running an FX5 which again is way overkill. I was having a similar problem with my 80 gallon when I was usin a fluval 404 in there, everything would build up so fast and looked like hell, once I put the fx5 in there things changed drastically, and I was able to add alot more things to the tank without consequences.
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80g
fluval FX5
(2) 300 watt tronic heaters
T5HO dual ballast lighting (power glo, marine glo)
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10G Nano
Fluval 404
power glo
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