Just remember that they are "non-discriminatory", meaning, they will kill first stage larva of isopods, amphipods, mysid etc. too. This may not be a problem for you, in a mature reef tank, with
refugia. But, for smaller systems, and those that require heavy pod populations (i.e. for mandarins, sygnathids) you may end up causing a downturn on the populations of these critters.
Just like everything in life, there are pros and cons that need to be discussed and thought of before making the decision. Personally, I didn't use one on my seahorse tanks, just for the purpose listed above. However, I do plan on using one on the new 56 column (Reef) that I'm setting up.
Dave
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