I think you'll find the Temp is too low for most of the South American Suckers... my tank also has a couple Flying Foxes, & a medium Sized pink Kissing gourami... I mention this Gourami, as in my tank it's a gardener, keeping the algae under control on the plants...
I went back through your thread, sorry about missing the Pandas... were you a part of the "bio film" discussion a while back??? I think you have had yours longer than I, but I have been supplementing my bio film with Bacter A E... & so far ( fingers crossed ) mine have been doing well, with the Bacter AE, Repashi, tank Bio Film, & food scraps from the other fish