Follow up question. Is there a "max gap" recommended for tubs in a rack system like this, based on size? right now my carpentry wasnt perfect, and it varies from 1/8 to a little over 1/4 of an inch.

With this 1/4 of an inch allow enough airflow? (I would hope so).

Is there any point in putting side holes in these tubs now that i have it in a rack system (not lidded?) I think there should be plenty of air flow into them from the tops, but i could be wrong.

Thanks