Hey Bob how well does it work for the Coraline? I have some in the back corners that's thicker than **** so I have been avoiding doing it. How big is your tank and how thick is your glass? Thanks!
i only have a 75g. Glass is 3/8".
I had some pretty thick spots as well and going straight at it w/ the entire blade doesn't really work. What i do instead is kind of go at an angle and use the corner of the blade. That seems to do the trick and results in pretty large flecks of coralline peeling away.
I'm pretty anal about having the glass super clean and, prior to having the flipper, it was difficult to get the the areas by the silicone sealant as i didn't want to damage it. I would end up w/ a line of purple running vertically at the corners and it bothered me. Anyways, that problem is solved now because this thing gives me more control. Oh, and the growth i had just above the sand line is gone as well. I wish i could use it on my tunze pumps too!