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Male Betta fish will fight with another male to the death and even fight with a Female Betta fish, but will not bother other fish of different species in the tank. I have a cory cat and Chinese Algae eater in my Betta tanks with no problems. Bettas will usually ignore other the fish in the tanks. You can even put a Plecostomus in the tank as long as the tank is large enough. Male Bettas can be fin nippers, but will usually do well in a tank with scavenger fish. Joan
If you have a filter system you should not have to do full water changes. Only part water changes if needed. The algae eater should be fine. They will eat the algae and any of the droppings the Betta does not get. YOu can get some algae pellets if you do not have any algae on the sidesd of the tank to engure the fish has enough to eat. Joan