Are the fish scratching at all?
Thanks Ben that its my next step !Alberto, you can lower your salinity a bit to 1.023 for now and stop dosing. Until alk reads around 8 then let evaporation brings it back up to 1.025SG. This should improve the health of the fish while the corals consume the excess alk. Make sure they eat.
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i think so to .That tang looks like it has a bacterial or fungal infection imo.
thanks man its ok when i gt home tonight i will handle him . he ben tru a lot so i think he will make it . i have that fish since my first tank and he been all over the place . i re-home him once after he live in my old tank sump for over 3 months because my trio of yellow tangs use to pick on him for being the smaller .Damn sorry to hear this...