Today I went to my local petstore. I live in a small town so the store is equally small. So. I was browsing the betta and the tanks. So expensive here!

I went to the back where they have glass tanks and I saw a 5 gallon (maybe 6) glass tank. Run of the mill basic tank without a lid. The sale price was 6$! So I bought the glass tank, a thermometer, and a Terra cotta pot.
When i got home my mom said "You can't put koichi in there! It's been used"
I admit it is a little dusty but is it really inhabitable?