The fish I regret giving away the most has to be my male Red Tiger Motaguense. I grew him from 3" to 5" in the matter of months, but had to let him go as my tank was getting crowded. I saw him a few days ago for the first time in 3 months, and he's grown into a monster at ~8". I'm kicking myself now for letting this one go.
What about the rest of you, what fish do regret getting rid of the most?
What about the rest of you, what fish do regret getting rid of the most?