I have a 125 gallon tank with a fluval fx6 filter. Should i add airstones and a pump to add oxygen? I have a petty good turnover rate with the fx6. But i don't want to start buying fish and not have enough oxygen.

Most people say no need, but I do. It has not hurt. If you over stock your tank I would. Even if you have lots of plants.

Rick I'm going to just start with a few pectos, a red tail shark and a few top swimmers. And eventually a few catfish. Like a shovelnose after the rest get bigger. Is the thought anyways. But I've thought about a air stone or wave maker just to be safe.