I would go with and 8" x 39" phresh or phat filter which is a 950cfm rated filter. U always want a filter that handles more cfm then your fan pushes or the filter is worthless and will not mask smell correctly.Also this mold u speak of what exactly happened PM, Botrytis, root rot ??
Peace
Dioxide
With out a pic is tuff but male plants will drop balls and open in veg 18/6 or even 24. I just pick them off each day to keep them under control until they are needed. The older a male plant gets they seem to do this more. If they were from seed then it's probably just a male. Male plant day 20...
Apollo-13 is old brothers grimm Genius x P75 now clone only. I think they only made like 500 seeds back in the day. Now Subcool or TGA has a A-13bx. Which is A-13 x Vortex (A-13 x SQ ) IS VORTEX. I have a couple bros running some now and they look just like subs A-13.
Peace
Dioxide