LowCel;2827176; said:The 300 will be at least a foot longer. However, I am kind of thinking about getting the 340 from glasscages. It is almost 11 foot long. That would be pretty cool even though it is only two feet deep (front to back). The actual measurements are 130"x24"x25'. I just haven't convinced myself of doing the drive or spending that much money.plus I've read quite a few negative reviews of their tanks so that has me worried as well.