Rather than have a best/worst fish for a planted tank I though it might be fun to start this bit off with a slightly more unusual question.... "What is the most 'unusual' fish that you have, or want to have, in a planted tank?" They could be very rare fish, hard to source or things that people never normally think of being suitable for planted tanks. What started this idea is a tank I've seen on another forum that had a piranha in. Personally I have killifish in all my tanks, so they come into the rare / hard to get category at least! Anyone else got any unusual ideas for fauna in a PT?