I second the tank cover tight and secure. They WILL jump out (I lost one and found another one in time and threw him back in).
I used Tahitian Moon Sand and regular play sand. Both work well, it's just personal preference.
I also keep the temp around 78 degrees.
Filtration will depend on the tank. I have extra filters laying around so I have mine loaded with 1 FX5, 1 XP3, 2 AC110s and an Emperor 400 for a 125G tank.
I currently have 11 Kapampas in my 125G tank and they vary from 4" to 6.5" or so.