About 3 years ago i left the hobby for about a year, i got bored with my 25g, my solution was that i got a whites tree frog and kept it in the tank. But it was rather boring. So i turned the tank into an aquarium, got a 100g, 40g, 14g and a 2g. That is my current position, and i have never been as active on mfk as i am now, i am growing out an endli, lap and a jardini, will take long to get bored with them.
IF YOU GET BORED:
Dont quit the hobby, try something else, if you have american cichlids, get malawi or tanganyika, dwarfs, rainbows or some monsters. I you have tryed this all or keep all in different tanks, set up some smaller tanks and find something easy to breed, then something harder, things will not get boring if you have a decent breeding facility with a few species of fish.