Got a 40 gallon feeder. Need help finding fish for it. Preferably one fish that's pretty big. I've had a cichlid tank before so I'm not a begginer. I'd prefer to not have substrate like sand or gravel so I don't have to vacuum the bottom. I have family that has had plenty of fish before so I also have help from them if needed. I know my tank is too small for an arowana but something aggressive is what I'm looking for. If possible something I can feed with pellets and supplement with feeder fish.Thank you have a nice day