1. Flash Pleco, L204- 5.2" 130mm
2. Imperial Pleco, Zebra Pleco, L046, L098, L173- 3.2" 80mm
3. Clown Pleco, Ringlet Pleco, L104, L162, LDA22- 4" 100mm
4. Queen Arabesque Pleco L260~ 5" 125mm
5. King Tiger Pleco, Network Pleco, Scribbled Pleco, L066- 4.8" 120mm
6. Leopard Frog Pleco, L134 4.4" 110mm
7. Bristlenose Catfish, Common Bristlenose Catfish, L?- 5" 125mm
8. Starlight Bristlenose Catfish, L183- 4.0" 100mm
9. Butterfly Pleco, Flounder Pleco, L168- 5.6" 140mm
10. Tiger ''Peckoltia'', L002, L074- 4" 100mm
11. Candy Striped Pleco, L015- 4" 100mm
12. Angelicus Pleco, Portel Angelicus Pleco, L004, L005, L028, L073- 4" 100mm
13. Chocolate Zebra Pleco, L270, L307, LDA76- 4" 100mm
14. Dekeyseria sp., Butterfly Pleco, Flounder Pleco L052- 4.8" 120mm
15. Pitbull Plec LDA25 - 2" 50mm
16. Brown Dot Peckoltia, L006- 4" 100mm
17. Leopard Peckoltia, L008- 3.2" 80mm
18. Hypancistrus sp. L129- 2.8" 70mm
19. Spectracanthicus sp. L254- 4.4" 110mm
20. Panaque sp. L306, LDA64- 4.8" 120mm
There you go a list of 20 Plecos that stay under under 6"