I have to agree that it is very potent. I do find a difference in coral colours and growth when using it. I don't use it/dose it religiously; only when I remember to.
A couple of things to note:
- expect a bit of a noticeable algae bloom on the glass of your display after using it.
- anemones don't seem to take well to it if you overdose (like anything else) or dose it in a specific area near the anemones.
- I also found GSP out of all things; are also quite sensitive to it as well.
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