Hey problem of withering leaves seems to be solved. wasnt reading my pH correctly. Got a digital reader, purchased a bottle of "PH Down" and i brought my waters PH from 7 to 6.4...and overnight...BOOM!! Iv also switched it to 12/12 and its growth has exploded, but with one problem fixed another occurs....im worried they will be too big for the PC Box. Theyr ALMOST touching the CFLs which are cool by the way. Should i be worried or will it be ok?

Is tying them down in anyway possible?

Heres some pics...