Problem is they won't be supported in an ebb and flow. Much bigger pots or those 8x8 rockwool cube. Those net pots will grow you about a 3 foot fair plant.

Yes either make a top and cut 3 1/2 inch holes in it or Get some 10 to 20 gallon plastic storage tubs, dark so no light. Your like using the tray for a rez with a top. Now it's like your bubbler with drip. Get a timer, 15 minutes every 2 to 4 hours. You need the bubbles. You don't need fancy timers. You can leave drip running all the time but your not drip to waste so drip back to rez. If you leave it 24/7 you would have problems with rot around the top of the net pot in the air roots. Not pretty.

Bring the PH down .5 a day and keep rez temps down to 70 degrees if you can.

Hurry up dude clones are waiting. lol