What not to do!

[Canadian Man]

Seems like I alway's have a brain fart every year when it comes to my tank. last year some of you may remember the paint in the tank thing

Anyway just a head's up.

I recently made some DIY rock and I put it in the spare bathroom's bathtub to cure it because the water changes would be easy. Well the water change thing was easy but I took the rock out yesterday and there is a thick layer of calcium sandpaper crust on the tub. The same kinda thing that bung's up your inpeller's on pump's and powerheads.

Anyway comet dosent work at all so I emptied a gallon of Vinegar into the tub and kept putting some on the side of the tub. It took a few hours of going back every few minutes and alot of scrubing to get it off but it's done.

Once again, just a heads up

Almost caused alot of this but I got it off and now i'm an