I think i have 2 many fish in my tank need help!?

right now i haqve 2 needle fish 2 tiny green puffers 2 large leaffish and 2 clown knife fish and 1 black knife fish and 2 plecos in one tank. I plan on getting one of thoose 29 gallon starter kit to put all the puffers and different knife fish ind does anyone know how much the 29 gallon starter kit at petsmart costs?