Would a dwarf lion hide a lot during the day, I don't want to buy it and never see itAbsolutely not, a lionfish would outgrow that tank very quickly, with fins sticking out of the water and such. You should consider a dwarf lionfish instead. Lionfish need 75-120g+ tanks.
EDIT: Just realized that you said Dwarf Fuzzy Lionfish. Yes, a single dwarf fuzzy will go well in that tank. My bad. Heh Good luck!
What would be good tank mates in that size tank? I know the lion fish will eat anything that will fit in its mouth but I'm not sure on what tank mates to get
Iv been looking at valentinnI puffer, would a pair of large clown fish be too small and aint seahorses quite hard to look after?I think some dwarf seahorses might work, maybe something else.... You have a lot of options. Just be sure that neither fish is big enough to eat each other.