if you told us earlier today.. I wouldve brought u some
I was totally in your area.
despite all the claims of how harmful this stuff is supposed to be on the internet....I've managed to dose the tank just fine with guestimations and had the formosas survive.
I guess if you want to dose, you should definitely take the fish out too. give them a milder PP bath and nuke the tank with extra strength PP. it does turn your tank brown (be warned!) so if you have white sand or something ...>.>
it can however be scrubbed off the glass.