I live un SW florida and I breed ASF rats. I have a rack with five concrete mixing tubes with a 1.2 ratio and about 50-75 grow outs in two different tanks totaling about 70 gallons. I try not to keep the door open very often but sometimes I have to let some fresh air in. Flies are all around and I'm seeing little worm larva in the bedding that is wet or the spoiled corner. What can I do to prevent this? Thanks for any advice you have.