quick note about the petco tetra tank 40 gallon
Glass is thinner
the plastic rim is larger than all glass! this means you MUST buy the glass lid from tetra.(its like 3/16" smaller)
Due to the larger rim, my aquaclear 50 will not sit right on the back.
The tank bows about 1/4" seriously, i look at my tank and you can see it when the glass lid is on.
I have salt build up that I am ALWAYS cleaning up around the edges and a lot of it I assume due to the bowing? Ive never had any other tank do this.
its a great deal for $40 but All glass is superior