yeah...Bubble Yum...
I don’t have major shading issues. Most tanks only have one fixture wide (a couple have two end to end), but the new backup system has broader tanks with two parallel units over 30” wide tanks to create a “hot zone” of 6-700 PAR where they overlap in the middle. It is far less of an issue with dispersed panel arrays like Reefbreeders than it is with the concentrated pucks of other brands.
2 huh ? How far from the top of the frag tank are you hanging them ? And running at 100% intensity as you always do ?