IMO 24/7 food supply wasn't neccesary, I only fed my African Aros 1x a day. They grow hella fast too. My water was never an issue for my African Aros. When my African Aro was 4"-5", it ate small pieces of shrimp,blackworms.
I use to do 90% waterchange on my 10g with the African Aro(not recommended for other people).