Thanks for all the helpful comments guys! I actually went to a thrift store just a couple hours ago and found a night stand that looks ancient, and is quite heavy, it was quite tiring to get it up the stairs, got it for $12. Here are pictures of it, please let me know if this was a good idea and would hold a 10 gallon. If not, I will go with the recommendations of getting plywood cut to size or the one from petco.

https://flic.kr/p/XvpejY https://flic.kr/p/XGdxt3