New clownfish from neighbor is there something wrong with?

[winxp_man]

So I just gotta get one of those and slowly bring down ?

At this point you need to first off get something that can verify your findings. That is a must. Again my post is only to give info as a possibly of what could have happened. Being I recalled my brothers situation when he was in it.

Do you have LFS’s near you that could have a hydrometer in stock? If not as @Fish Fan stated make your own solution. To check calibration. Or maybe a LFS has calibration solution other than what you have that would work as a verifying tool.

But for now don’t do drastic changes you might harm the others in the tank.

Salinity drop, or rise can be sensitive to some vs others.