I have numerous types of large cats, tiger shovelnose, redtail, and a goonch. I found a neat/effective way to get them to eat with less competition. There is a product call Moonbeams they are small glass tubes wit about 5 leds per tube, you will need one tube for every 3 cu.ft. of water. they dont light up much but if you feed live especially it makes the cats more active. Since most cats are more active at night anyways. ****before anyone jumps on the fact that goonch get very large yes they do, But I have dedicated alot of time and even more money in a very large 2-wall tank. approx. 2600 gallons, with 14 fx5 filters and one large almost pool style setup.****