Don't know much about the NC28 but for the BC8, try popping the back part open and leave it open. You could even add a fan there to blow extra air over water but it will increase your evap so ATO necessary.
The fans in the hood are too cool the PC bulbs, not the tank. They are noisy and if you are going to replace them, just buy the same size ones from a local computer store. Spend a buck more and get a controllable fan with actual bearings.
I would check the pumps, might just be worth swapping it out. MJ400 or 600 should probably be enough flow (I'm only running a MJ900 on my BC29) and they are relatively inexpensive.
Just my 0 cents (2 cents round down now that we don't have pennies... lol)
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