ended up downsizing to a 20 long good thing i only had 4 fish in that tank. the center brace broke, i didn't trust it. used some flourite i had instead, thinking it might be easier to vacuum. it's gonna look like a jungle with those plants stuffed in there even after i trim them down.
plan to replace the 55 with either a 75 or 90.
Shouldn't be vacuuming the substrate anyways. Simply hover the suction tube a couple inches about it and allow waste to flow up off the bottom. You'll want to leave some though as a little is healthy for the plants just remove what's visibly unappealing.