I have 2.5 gallon jar I keep a betta in the summer and 3 gold white cloud minnows in the winter in. I have no filter, no light, no cover. I have never had a jumper, not saying you won't, just saying in 2 years has not been a problem for me. This jar sits on top of our "laptop" table in the den, there is a skylight that is 25 feet above it, the room is very light as it also has a wall of 5 glass sliding doors. When I first set it up 2 years ago, I put a 3 leaved anubias in it, today that same anubias has over 15 leaves on it. I faithfully change 80% of the water weekly (I have well water), during which I do take the anubias out of it and wipe any diatoms off the leaves, quickly, with a paper towel. My set up is not as nice as yours, but it can work.