No metal stand, but I do have an old knockdown (bolts together) pine stand that will hold a second tank under the top one, not sure offhand if 2 55's will fit though. It's up in the attic in pieces now, haven't used it for years.
Also have a homebuilt 2x4 stand that doesn't come apart with a bottom shelf suitable for a 20L or 30L, not enough clearance for a 29.
Have a black laquer cabinet stand for a 55/40L too.
I have a couple of Marineland 55's on hand, a solid black trim tank and a brown trim tank with a broken center brace. Unopened tube of silicone, but the local glass place closed so I can't get eurobraces cut for the tank.