i have a total of 4 in the tank, i thought i read that they could eat fish.. hmm maybe i can take 1 to a store for some credit lol.. my watchman is really active.. he swims all over the tank, i thought they were supposed to just hang out under some rocks.. yea the red stuff is cyano.. i gotta figure out why its there.. maybe phosphates? i gotta get a test for those now..