I was thinking of getting a MBU puffer to put into my community tank, I have a automatic drip system,but my water tends to be on the low Ph side it is a 420 gallon tank with a lot of fish in it,do you think that an active busy tank would not be good to keep one In,as it could not key in on one fish. I have stuff like wide bar silver dollars red parrot,green and red Severm,14inch tire track eel and fire eel 12 flag tail and many others. what side MBU puffer should I start out with?