Yeah copper is very toxic to inverts, will also soak into your gravel and seams of the aquarium and keep killing things even if you drain and refill your tank.
When you use medicines like that you should just put them in a small bucket filled with water and the medications. Or even better set up a hospital tank that will only ever be used for meds. _________ Link to My 75 Reef Hardware 75G 20G DIY Refugium/Sump 2 250W MH, 4 65W PC Koralia 1 and Koralia 2 Powerheads for Currents Mag 9.5 for Sump/Fuge Return TLF Phosban Reactor Coralife Super Skimmer Software Domino Damsel Coral Beauty Maroon Clown Diana Hogfish Skunk Cleaner Shrimp
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