Originally Posted by CrimsonBlayde
It's a 30 gallon. I meant to put that in the original post but was distracted by the kids. My apologies!
Sorry for taking so long.
In my opinion there is no such thing as too much filtration but lets look at wether the 205 is adequate.
The empty flow rate is 680lph on the 205.
A 30 tank ~114L
Minimum filtration should turn over the tanks volume at least 6x an hour.
this filter provides you was the bare minimum. And is only adequate for a low bio load.
I wouldn't go for the 305 but would consider having a second filter. This has the benefit of providing a backup if one filter stops working.
Aim to have a total ideal flow of 1140lph.
My suggestion would be to add an aquaclear 30 which turns over ~570lph although you could get away with an aquaclear 20 at ~380 lph