Yes. Just remember, everything you add must be removed, by YOU. Just because something has been eaten doesn't mean it's gone. It's just changed to something else. This is why I tell people that "cleanup crews" have been invented by companies to sell livestock. You are the cleanup crew in a closed system. Feed a dog a sandwich and you still have to pic up his poop!
Weekly water changes are a good start. Once a day, reasonable feeding (I'm worried about the puffer getting looked at as food).