I paid someone else to build this basic shelf for me because i'm no carpenter, but i'm a little concerned about it's integrity because it will be holding aquariums. It's a frame of 2x4s with enough 2x4 braces running from front to back for the tanks to sit on, each brace is screwed in to the frame at the front and back with two screws. The problem is that half of the braces were short so there are 1/4th inch gaps instead of them fitting flush against the frame. Will they be able to hold 225 lb tanks like this? Or is there a way I could try to reinforce the braces? The mending plates were added when I pointed out that I was concerned about the gaps.
Edit: More pictures. One the top shelf all but the 2nd horizontal board from the left has the gap. He also added this scrap piece on here when I told him I wasn't comfortable with the corner of this tank floating.