ok.....verdict
does it work??? Yes
Is it faster than elbow grease. No. about the same amount of time. This could sway in favor of elbow grease with less thick of coralline than I showed you, and in favor of the boiling water unit with thicker stuff than I showed you
Is it safer than elbow grease and a plastic scraper designe for acrylic on coralline as thick as I showed you. Yes.
It is surely easier. the unti actually would ROCK if it could do more than 1 square inch at time. It cooks the square inch in less than ten seconds, but it still needs scraped off. If the unit could do 4 or even 8 square inches at a time I would say it would be worth its weight in gold.
Is it worth the $70 after shipping I paid for it?? kinda. Ill be using it at times...especially for the next couple of hours.
my conclusion.....if you have acrylic tanks....dont let them get in this condition. If you DO regularly let them get in this condition and want them clean......i guess its worth buying