You need a chiller to keep res cool, like 65 degrees, i run recir. dwc and i always got rot rot until i cooled water temps. Also seal up any light leaks on res. and buckets.
The limit in Arapahoe county is 12 plants per household, no matter how many red cards in house. Make sure you check your city and county for any laws, because johnny law sure knows these rules and will surely use them against you.
they are called uniseals, you can get them online in various sizes from aquarium supply co. I just bought some from aquaticseco.com, they come in all different sizes.