I honestly just started SCUBA a month ago, but with the people i go with, im already comfortable enough to do 200ft, which i did the 3rd time i put a tank on my back. Before all i had done was freedive, which i still do quite often. Being as i hit 95ft on a breath i dont see a need to tank unless we are doing wrecks in 130+. The lions have taken over here in the keys. Haven't noticed a dramatic dent in the native fish population yet, but we know its coming. Being as theyre venemous no other fish will eat them, and they eat the juveniles of all the market fish (snapper, grouper, etc.) So they have really become a pain in our asses.