03-22-2008, 01:22 PM
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There is no way for me or anyone else to say if it's a good addition to your tank because we don't even know how big the tank is...???
Or what's all in it besides the lobster and a few hermits...??? Can you please list all of the tank inhabitants, how much live rock is in there, what substrate you're using (live sand or crushed coral), temp, etc. ?
How long has your tank been set up? What is your spg/salinity? Water params?
Please be aware, the purple lobster, while thought to be reef safe, also has the ability to eat small fish and other inverts, especially bottom dwelling fishes such as gobys. The lobster is a carnivore, and if it feels crowded, it will fight back and kill whatever it needs to while protecting its terriroty. Consdering they get about 6 inches long, it should be kept in a good size tank... at least 55 - 75 gallons if mixing in other animals, and it should have lots and lots of live rock in the tank. They are primarily nocturnal feeders, so if its going to cause a problem in the tank, it is most likely to happen during the nighttime hours. If the tank is large enough and has compatible tank mates, a longspine urchin should do just fine. The lobsters are very sensitive to any change in water params and salinity levels, so you'll want to test often for ammonia, nitrite, nitrate, pH, calcium, and iodine, and you'll want to really stay on top of feedings and water changes.
Longspine urchins thrive strictly on algae, including macro algaes... (caulerpa)