happy growing
ona blocks or gel....a small block or small amount of gel will remove the smell...anything aerosol spray type air freshner wont work to well..it only masks the smell..where as ona blocks will remove the particles on the air making the odor.and def need to get each seedling in its own pot....and i wouldnt wait...if you wait for them to be stunted to transplant the roots will have grown into each other...probably will kill all 3 plants trying to remove one...since they are started already i would transplant into something like a 4-6 inch pot....then after its made a good rootball in that transplant to a 3 gallon or more container...its not good to transplant more than 1-2 times...but in this situation it would really help you to do so.and using cardboard for your grow box is just fine.the way i did mine is...i got a $3 box at walmart..molded it and shaped it to the size i wanted...lined the entire inside with a thick plastic layer...then put mylar on top of that.long as your not sloppy when you water...and have a trey under the pot for when you water it...no mold..no damage...ive grown in full out 10k grow rooms,hydrophonic glass systems,and right outside....some of my best results has been in this box i have now
the fan isnt going to make your temps go up...its trapped air..and 94 is way way to hot...i just went through the same issues with heat....you need some good venting at the top of your box..heat rises,not sink.toss some cpu fans up there or any small fan that can pull that hot air out of the box...kinda odd that the fan would make it hotter...would think it to work the other way around