Do you recommend replacing both of them? Only the bottom is damaged. They seem to go for $15 each and I only paid 40 for the tank so I'm wondering if it's even worth it considering I can get a 55 gallon for $55 from Petco if I wait. Also, this tank is made of tempered glass, and I've never had one like that. Other than not being able to drill it is there any disadvantage to it?