There is an issue, due to the weight of the water, where the spool pulls down disputing the alignment and pulling the floss off-center. I've added the side support to help mitigate this but I think the problem is severe enough to require a rebuild.
The new design will be narrower so there will be less overall water in the catchment area. This will reduce the water weight pushing against the floss so in-theory it should be easier to roll-up and less likely to pull enough to misalign the roller.
my skunk cleaner shrimp is looking pretty rough. he may not make it either... dang. brings my 2 week total fish loss to 1 cardinal fish, a wrasse, and a shrimp.... I haven't seen the court jester goby since the first day... hope I didn't grind him up too... Surprisingly the green-stripe goby is accounted for.. He just hangs out on the back glass so I can sometimes spot him.