I do pwc
weekly, about 75% if not more and he's in brackish water. No cuc at all. It also helps that I have a top fin 40g hob
filter on the tank so plenty of filtration. I would love to be able to fully acclimate him to a marine salinity and put him in my 40g breeder FOWLR
tank, but all the research I've done says they are best kept as brackish only. I would love an indoor pond setup but I am renting a condo and am gracious to get away with my tanks. I'm glad you are still able to visit your oscars though.