I Found some trout a couple weeks ago in a drying up pond next to the river so i decided to take them home and fill up my 20 gallon they are about5 inches and 3 inches. I know everyone says that trout wont live in a aquarium without a chiller? These trout are cuthroat-rainbow hybrid trout from warmer river were they are mostly in the 60 70s so im hoping they will live. They look great and are active they are eating brine shrimp and blood worms and will eat flake food but they hate it and spit it out. I will get a bigger tank for them as they get bigger becuase I know the 20 gallon is not even close to being big enough. So far Ive but it a big powerhead to simulate a natural stream and added 2 air pumps to add oxygen and aerate the water. HAs anyone else kept trout and have anything they might want to add? I know they like clean water so i am going to do a 50 percent change per week.