01-08-2014, 01:40 PM
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That's one thing carbon is for. It does absorb funky colours and avoids odors, but it also absorbs heavy metals and other things that are in the tap water and fertilisers added for plants.
Carbon is fine for non planted tanks, but it strips too much from the water to be good for plants.. And pretty much nulls out any added fertiliser that's in the water column.
And what may see says is correct. As long as your levels stay stable after cycling the tank..you've got enough filtration. If your fish are struggling to swim and getting blown about, you need to dampen the flow. If you can't dampen the flow enough then you've probably got too much filter.
I ran my 28gal with only a single sponge filter and it was adequate. I didn't have an angelfish, but I had two schools of tetra/rasbora, a school of cories,, and then depending on the timeframe, either a Gourami or a ram. With a full grown angel I would've probably upped the filtration, but you've already got much more than my one sponge.