This might be a 30g, I'm not sure what it is actually. I put the cypress in there that ithad in the 20g long, and it filled up the same. I think this is a 29g, but I really have no clue what it is. I used it for my RES a while back, but honestly Idk what it is. I could measure it, in a bit though.
I might get a new enclosure this week, but it depends.