25 Gal 50 Gal 75 Gal 100 Gal 150 Gal 200 Gal Lettuce Slugs 1 2 3 4 5 6 Lawnmower Blenny 0 1 1 1 1 2 Serpent Starfish 0 1 1 2 3 4 Sand Sifting Starfish 0 1 2 3 4 5 Astraea Snails 5 9 16 22 28 35 Nerite Snails 7 12 17 24 30 38 Margarita Snails 7 12 17 24 30 38 Turbo Snails 0 3 6 9 14 21 Nassarius Snails 7 12 17 24 30 38 Cerith Snails 7 12 17 24 30 38 Tonga Fighting Conch 1 2 3 4 5 6 Red Leg Reef Hermit Crabs 7 12 17 24 30 38 Blue Leg Reef Hermit Crabs 7 12 17 24 30 38 Zebra Hermit Crab 3 6 10 14 21 28 Sally Lightfoot Crabs 0 1 2 2 3 4 Emerald Crabs 1 2 3 4 5 6 Atlantic Sea Cucumbers 0 1 1 2 3 4