I think my fish r sick

[justahobby]

I would recommend a water change to start with as well. Don't do anymore than 1/4 to 1/3 tank volume in your water change. Any more than that you risk setting your bacteria cycle back. Also, tangs are more prone to ick than clowns, so look for shimmying or scraping by the tang. He's your best indication of ich.

Free floating bacteria make up a very small percentage of bacterial diversity in our tanks. The majority, at large, are sessile and will be found on your live rock and sand. Which is why we buy LR and established sand. A 50% water change done correctly will likely not affect the nitrogen loving bacteria in our tanks.

It is very important to ensure good salinity (with a tested, accurate instrument), temperature, oxygen, and ph. Especially when dealing with sick fish.

Sorry Randy, not trying to pick on ya.