Planet Aquariums Glass Tops Size:195 236 3pc Set and Ocean Nutrition are ideal Size:Medium (3 1 2" to 4 1 4") and Ocean Nutrition are ideal for this purpose and are user friendly Because we care: PraziPro® has been developed to offer assistance to aquarium or pond keepers who are encountering problems with unwanted worms or parasites and for ease of use by the user Glass top set includes: glass 60 Cube Glass Top: 24 1 2 x 24 1 272 50OV (OceanVue) Glass Top: 36 1 2 x 18 1 2 72 50OV (OceanVue) Glass Top (White): 36 1 2 x 18 1 2 90 Glass Top (36" Tank): 36 1 2 x 24 1 2 75 93 70OV (OceanVue) Glass Top 3pc Set: 48 1 2 x 18 1 2 75 93 70OV (OceanVue) Glass Top 3pc Set (White): 48 1 2 x 18 1 2 120 140 Glass Top 3pc Set: 48 1 2 x 24 1 2 155 Glass Top 2pc Set: 48 1 2 x 30 1 2 100OV (OceanVue) Glass Top 2pc Set: 60 1 2 x 18 1 2 100OV (OceanVue) Glass Top 2pc Set: (White) 60 1 2 x 18 1 2 150 Glass Top 3pc Set: 60 1 2 x 24 1 2 175 Glass Top 3pc Set: 60 1 2 x 24 1 2 195 236 Glass Top 3pc Set: 60 1 2 x 30 1 2 142 Glass Top 3pc Set: 72 1 2 x 18 1 2 180 215 Glass Top 3pc Set: 72 1 2 x 24 1 2 235 280 Glass Top 3pc Set: 72 1 2 x 30 1 2 220 260 84 24 Glass Top 3pc Set: 84 1 2 x 24 1 2 270 325 84 30 Glass Top 3pc Set: 84 1 2 x 30 1 2 240 Glass Top 3pc Set: 96 1 2 x24 1 2310 375 Glass Top 3pc Set: 96 1 2 x 30 1 2450 Glass Top 3pc Set: 96 1 2 x 36 1 2