does not fit the marine land (petsmart) 75 gallon due to the silicone used in the aquarium as intended, I tried, but the clearances from top to bottom are too tight and leave no room for factory/aquarium silicone. Even with some grinding to fit from top to bottom you have an about an inch from left to right. So for a peninsula style AIO it didn't work, so I tried again and attached it to the back of the aquarium. I give it 5 stars as a AIO DIY addon when used in the back, but I took 1 star ...