Join Date: Jun 2012
Location: Melbourne, Australia
As long as there's ripples on the surface, there is oxygen diffusing into your tank. However if you feel worried about your fish(es) not getting enough, then feel free to add an air system. I just would look for a smaller unit; they way your not wasting your electricity bill, betta isn't going to find it hard to swim against and you still increase oxygen diffusion.
But I would totally reccomend a school of pygmy cories, especially if you have sand! However they not a substitute for tank maintenance so you still have to make sure that your sand is clean - to reduce infection. They do help stir up the detritus so that way your filter can pick it up, but overall they not vacuum cleaners.
540L/140G - 'Tidal Jungle' (Crabs) | 254L/67g - 'Backwater Pool' (Fish/Snails) | 96L/25G - ''Twisted Minds" (Fish/Snails)
I've never had any problems with 'Impulse Buying'. They're just animals that I forgot I had planned to get.