A few to consider would be Calvus or Comps, small Julies (like Ornatus or Transcriptus), Caudopunks, or Telmat. Vittatus. Tank is too small for cyps, but paracyps might be ok (not sure, never had them).
Punks are great little fish. Active, plenty of character. I think you will see plenty of interaction between your meleagris and punks. The other thing I like about punks is that you can sex them. Small rockpile at either side 2 pairs of punks and you shellies sound great.