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Let me know the size for the spacer, and I may be able to guess. It's not thick. No way it's 1/4, I'd guess it's 3/16.was wondering what the thickness of my glass on my biocube would be because it says ou need a rubber spacer depending on specs heres a photo
3/16 it says u need to use the spacer if so ive been using it so i think ill just leave it onYou don't need the spacer. I also have a 29 gallon biocube and mp10. I do not use the spacer and have not had any issues. You can typically find the dimensions on retail websites though if you are worried about it.

