I have one of these guys and they are soo neat for sure. You don't see them very often, when the lights first come on in the morning I will see him for sure. I don't know what kind of tank you are putting them into but they are not that big and you would have to be careful what kind of fish also or they will become lunch. They are really meant in my opinion for nano tanks. Mine is in my 3 gal tank with 2 sexy shrimp, 1 cleaner shrimp, 2 snails and corals, no fish.