Corner wedges, extra nozzles, extra tubing, a ball valve and a tube cutter.
You really need extra nozzles "just in case" because they do occasionally fail. Plus, chameleons are just like potato chips: You just can't have one. One nozzle will likely be enough for one large veiled or panther, but it won't for babies or montanes in a screen cage.
Fifteen feet of tubing is not a lot. I suggest double simply to have extra on hand, not only for flexibility on where you put your reservoir in relation to the the cage (your cage might be on hardwood floors but you want your reservoir on top of tile) but also for the new chameleons you are likely to find you just can't resist.
I think the tube cutter is a necessity. Cutting the tube straight without it can be dangerous. I've used a cutting wheel (for fabric--basically a circular razor blade) but even that, cutting straight down has worried me. Plus you have to worry about what you are cutting on. A tube cutter allows you to cut it like a pair of scissors, you don't have to take everything apart and find a flat surface. You can't use anything like tin snips or side cutters because you will crush the tubing. You need to cut it with a razor blade.
Corner wedges are nice. You can make something similar with Coroplast. You definitely need some support for the mister nozzles.
A ball valve allows you to disconnect the pump from the reservoir when it is full without a flood. MistKing's pump is gravity fed, so is below the reservoir. Whenever you disconnect the pump, water leaks out of the reservoir which has it's opening right at the bottom.
I have used very few of the screw in clips for the tubing--none at the moment--just using zip ties, electrical tape and foam to stop any vibration and I have 27 cages (OMG! I had never counted them up before!) hooked up to misting systems.
Hope that helps.
