I can't get a bigger box but I add a smaller box next to it. Thanks to Will @Turkeysammich , Erin @Kensington Reefer for helping me tear down my sump (filled with macro aglae) and plumbed a IM 30L ext tank to it. Thanks to @derek_SR and @Darkxerox for pushing me to do this. It was a 5-8 months...