Hi, I'm thinking about changing the fish in my 6 year old 72 gallon. I have a cascade 1200 canister filter, florite substrate, very soft water with large amazons, anubias crypt and hygrophila. I now have 8 cardinal tetras,8 rummy nose, 1 golden algae eater and 1, 9 year old cherry barb.( the cherry stays) I would like angels, but reading so many posts, I hesitate because of the fighting that occurs. Is the canister filter spray bars detrimental to angels? Also, how many angels are suggested ? Thanks