For most invertebrates that are part of the cleanup crew, an established aquarium is an absolute must. Many aquarium keepers usually buy their cleaning crew early on in the tank’s life. And unfortunately, many of these animals die because they don’t have enough food to go around and the ammonia and nitrite levels are far too high. Some aquarists even stock a tank full of snails and hermits after just a day or two after starting it up. What aquarium keepers should do, instead, is take things slowly and treat the cleaners with just as much importance as fish and corals. Slowly introduce them, allowing them to adapt to the aquarium and letting the aquarium adapt to their presence.