Clownfish acting strange please help

[Splishsplash]

Hi, we have had our tank for a few weeks now we have a hermit crabs,turbo snails live rock some coral n shrimp living in there also seen a crab in the rock anyways it's only a small tank.. We brought 2 very small clown fish the other week and I noticed on the larger one a few white spots so I went and brought some tetra marine medica general all in one - which treats white spot ect: we put this in yesterday and since then the other smaller clown has just been laying on the floor breathing heavily not eaten all day and hardly swam the other one is fine still has few spots .. All the other creatures in the tank are fine and we only put a tiny bit of the stuff in. Will the fish be ok in a few days? or would it be best to get some carbon pellets in there now to clear it out? Also my partner just did a small water change but nothing new as of yet Any suggestions would be much appreciated thanks guys


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[glb]

What are your water parameters? Sounds like the tank is very new.


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12g Nanoreef. Zooanthids, Ricordia, Star Polyps, Acans and two clownfish. CF Lighting, 75% actinic blue, 25% 10,000k white.