With a 50x99 piece of 2" acrylic there's no need for any other viewing windows. No one is going to be back there amongst the filtration to see in from there anyway.I wanted to ask that same question, but I thought they were extra framed viewing ports for cheaper smaller 3/4" glass panels. Now you know why I didn't ask LOL.
that would be sweet...but add in like 20 discus and 12 GBRsNah, just a 1000 cardinal tetras