I currently have some Yoyo loaches and although I love them they got much larger than they were slated to have grown. My biggest one is over 6 inches long and very active. He or she is intimidating to my other fish and I probably would not purchase them again. I also lost my Gypsy King Tiger Pleco yesterday and would not replace it as it also was too big for my tanks. (but I did love him) I replaced him with a Clown Pleco, I had lost my Clown Pleco during a water disaster earlier this year when our town's water supply became contaminated and I was not aware of it until I changed the water in my tank and it killed my fish. We (the whole town) were without water for a week.

What has been or is now your favorite fish of all times since you began keeping fish?