even for 2 percula clowns (nemo), you should have at least a 20-30g...the thing is you can get these tanks so cheap now and you could always build a stand or set it on a strong dresser, etc. Keep the 10 for your qt
tank, then you know, you will need sand, salt mix, filter, sw
test kit, and possibly live rock and a skimmer. I guess the biggest thing is to study and plan out what would be best, but a bigger tank is so much better, IMO
no fish should really be kept in a 10g for long, though others may disagree...