erm, as a grow out tank? Acarichthys heckelli, though slow growing, grows to 12 inches. The turquoise sev to about 9 inches ... neither would have much room to turn around. And would probably claim the entire tank. Plus sev's would most likely (but not always) treat your plants as a self serve salad bar.
The South american leaf fish plus a dwarf pike (not compressiceps!!!) would work well with the BN pleco though. (I keep dwarf pikes in similiar sized tanks).
yes, i would give the fish to the LFS when they grow out. i think that would take a while though.
i already have the heckelii and the sevrum. the heckelii is about 3.5 inches and has been that way for about 6 months. the sevrum only chews on the moss ball and nothing else, im not sure why.
compressiceps would most likely be too overly aggressive for a leaf fish, they have been known to take out larger central american cichlids. Other dwarf pikes only quarrel with themselves (regani, noto's, wallacii).