Are these reptile or aqarium tanks?

[tj.]

I just found these 2 tanks at value village. The person had reptiles if some kind in them before but I think these are thick enough for fish. Each glass pane is almost 1/2 a inch on the left tank. The right tank is a little less and feels like a lighter aqarium. Would these hold the water for a new aqarium?

 

[delv]

Fill them and see if they still do, I can't think of a better way to tell.