Planted Tank Obsessed
Join Date: Jan 2015
Location: Carmel, Indiana
I do not have experience with fluval, someone else will chime in.
Looking up that bulb, it looks like it is an 18000k bulb which, for me, is not ideal for a planted tank. I prefer 5000-6500k for the look. The spectral graph for this bulb if very heavy in the blue and lacking in the red. I like to have more red in my light. Without knowing how far your light it from the substrate level and the PAR data on the bulb, it is hard to know what type of light you will get. Do you know anyone with a PAR meter?
The pH drop due to CO2 does not really affect the fish. However, if the pH drops more than 1.0, you may see the fish heading toward the top of the tank and gasping for air. Watch closely and if you see this, reduce the CO2.
The growth on the driftwook is normal and expected. It is fungal/bacterial. Snails will eat it.
Most snails leave the plants alone. If you overfeed, the snails will reproduce dramatically.
I would not put an Angel in there. It is a myth that fish only grow to the size of their tank. What happens is they become stunted and stressed and will die prematurely in too small of a tank. The small schooling fish would be fine.
What type of filter do you have?