i am soon starting my 300 gallon plywood tank build using liquid rubber. i got a quote from a local glass shop for 3 sheets of 1/2 inch non tempered glass. the front viewing panel is 70x25 for $184 with unpolished edges and $234 polished. the side panels are 34x25 and $192 for both and would be $254 for polished edges. my question is are polished edges necessary for a plywood tank and if so is their a cheap way to cover them or polish them myself? thanks