OP, it seems you completely submerged your bioballs. Bioballs are better in a wet-dry application. If the waterfall noise bother you, I suggest add a canister filled with ceramic bio material like matrix or eheim substrac pro. or slowly replace the bioballs with them.
and don't listen to fishermanbob. Your filter is suppose to convert ammonia to nitrate.
and don't listen to fishermanbob. Your filter is suppose to convert ammonia to nitrate.