He said that you will need a 20+ gallon tank.
And, you can if you want, I do too but I don't turn it on often. I usually will turn it on only when the angels are breathing heavily which means the gills are always opening and closing so fast.
Also, the reason why I don't turn on the air pumps so often is because, I put in a hand full of aquarium salt in my 29 gallon tank, and my 200 gallon I put about 20 handfuls of aquarium salt, and 350 I put the entire box of fine aquarium salt. That's why my aquarium cupboards are filled with aquarium salt, fish food, and the filters. I have one external filter on my 350, and side filter hanging on the side too
I don't use a lid for my tanks, so I have a little reading lamp hanging from the wall shining light onto the tanks. I can bring in low light, and medium light. I can bring in strong light, but I don't really need to.
I also have side filters on my 29, and 200 gallon tank.
Aquarium salt heals, and protects fishes from wounds, and diseases. It also helps with the breathing, it's like clearing your stuffy nose (if you ever had one) but I was just using it as an example.
So I suggest you buy aquarium salt, and it should really help a lot.