b'underwater that casual ocean swimmerswill never, ever, see. I feel like an astronaut because even though youre floating inwater, its like being in space, he says.Its quiet, relaxing, and you feel like yourein a giant aquarium seeing all kinds of fish that are half-yellow, half-purple, so manycolors. There are so many different typesof animals underwater.Yet a little over a decade ago, Mullerbegan to notice a few things that weremore destructive than joyful. Whilediving off the coast of Aruba, he observed that the coral were in really bad shape.This was due to a lack of tropical fish that usually scrub the algae off the top of it.Since the algae were able to proliferate in the area, the coral were dying. Upon further investigation, Muller learnedthat a fish species known as lionfish were voraciously consuming the local fish population, causing that ripple effect.They eat so much because theres so much choice, says Muller. You cant fish for them because theyre not going to take the frozen hamburger when they can have fresh steak. How bad is it? The Gulf of Mexico is totally screwed up.Texas, Alabama, the Pensacola area, its all horrible. Its a whole cycle. Muller created lionfishdivers.com, an educational website to spread the word about this growing threat.3'