Hi m8 , yes its always a good idea to have a carbon filter , I only had a 4" just about done the job tho , You should be able to control your temps abit better than i did with that 5" 1
The plants were in flower for 76days seemed like for ever !! but well worth the wait , These were sativa , But if was indica would took about 55-60 days , but well woth the extra little wait !