"SEA CLEAR" TANK. Help

[martinc909]

I have a tank made by SEA CLEAR. and i need to install my skimmer as a hang on. but the opening that a regular tank would have is covered with another piece of acrylic. i cant seem to take that piece off. how do i take it off?

 

[joebrooklyn]

Is it a System II tank?

 

[martinc909]

i used a dremmel tool and its off already thanks