Well, he we go with my 75g upgrade. This build will take some time to finish because involve removing a shower and a wall to be able to work on the stand. I have a closet behind the 40g and removing the shower and the wall will give me an small fish tank room. The most complicated part for me will be work on the wall behind the actual fish tank without moving the 40g. So basically I have to work from inside out where the 75g will be set. Here's a few pics of the project. That is a second full bathroom but we never used the shower. I will leave the toilet and the sink. Haha, the fish tank back glass will be painted in black so nobody can see thru..LOL. Also the closet door will be removed and fill with drywall. If you have any idea, please share with me. Thank you All.