Thanks! This tank has had various different plants in it over the past year and a half, right now it's almost primarily anubias (because it's my favourite and it's easy haha). I've also had success with hygrophila, dwarf Sag, vallisneria, bolbitis, red tiger lotus, cryptocoryne, aponogeton, Java fern, staurogyne repens, echnidorus and probably more that I can't think of off the top of my head. There is a plant growth substrate under the sand, so the plants thrived, I just got fed up of trimming them so opted to go with mainly anubias.
I did have some anubias in the sand (rhizome above the substrate) and a lot of it attached to wood, but I felt that the wood was becoming a hazard as many of the goldfish are quite big now. I opted to make a sort of rack (using egg crate). I didn't consider the fact that it floats haha, so it's still a work in progress. I have another for the other side of the tank, but I'm yet to finish that. I run 2 fx5s on here. They do creature plenty of surface agitation, but not so much that the plants suffer.
I'll be sure to! Hoping to get either a 10x2x2 with sump or an 11x2x2 with sump to fit in an extension. I'd like to have some kind of plumbing in place in order to make draining and refilling the tank much easier, too, but I'll research that closer to the time. 
