Lake Cicott normally has them. It is between Logansport and Monticello on 24, west of France Park about 5 miles. Those that I have seen are 2-3 inches in diameter.
I have seen small comb jellies kept in a cool water sw 35g hex tank that fed on brine shrimp ang copods but the owner had only had them a month and I have no idea if it worked out, they were from Bodega bay, Ca.