Uh oh I have red bug

[Proteus]

I notice red bug on two pieces. I thought something was off as my colors are fading. SO

I will go to vet to get some interceptor. But want to know

Is it safe for my clams
And is there any pill to water volume calculation
Should I take skimmer offline

I read that multiple treatment may be nessacery but wonder how long duration before skimming it out and wc