I have a simple setup, tank is 200 gallons with a foot print of 72 x 27". I am running two 4 chamber canisters with 9 watt UV in each one. They are rated around 550 gph each. I have overflows in the back corners that pull water from top and bottom, that water goes through a spin down filter, then into a mag18 then it splits off into each canister. The two canisters then return to the tank. I have a drip system that runs 90 gpd and that is it. The filters are filled with the same media that goes into the Ultima filters (very similar to K1 but sinks). I clean a canister a month and change the filters for the drip every 3 months. I feed mainly shrimp and tilapia with occasional homemade gel food. I feed 5-6 days a week.
Recent changes are I added the 12" female hybrid about 1 month ago. This hybrid came out of my other system that ended up with a bacterial issue. I decided to treat the 200 to be safe as the hybrid had some white on the tip of it's tail. I was on day 3 of the nitrofurazone treatment with the drip system turned off. The water temp climbed from 78 to 82 degrees since I was no longer adding cold fresh water. Day 3 is when the mating took place. At this point I am not sure what triggered it as the rays that mated had been together for over a year and the female marbles had been in that tank since day one. My guess is the water temp change coupled with the female fully maturing.