I have a 10 gallon tank with one male betta, 2 assassin snails and 5 pristella tetras. Also have a few live plants. Getting quite a bit of algae going on. I realize I might need to move the tetras at some point but they all seem to be getting along fine for now. Can I add a couple of cory catfish or will I be overstocking? If I can't, any other suggestions for the algae?