New updated grate design with 20% greater flow than previous model.\r\nThe CITR In-Tank Refugiums are \”safe houses\” that provide a protected area to help newly added fish orinvertebrates easily acclimate to a new tank while also providing a place for injured fish or corals to regenerate damaged tissue without the need for a separate quarantine tank.\r\nThe CITRs also function as a culturing area for small organisms that are intended to be provided as afood source for the inhabitants of the main portionof the tank. The versatility and easy use of the CITRs make them a valuable addition to every aquarist’s tank\r\nThe CITR 3 and the CITR 3 PRO both have slots cut out of the side, so that depending on circulation around the unit, a pump may not be required.\r\nCITR 3 has clear back andis attached to the Aquarius with heavy duty suction cups. CITR is available with (DX model) or with out pump.\r\nCITR 3 PRO has black back and is attached to the Aquarium with an adjustable bracket. CITR PRO is available with (DX model) or with out pump.\r\n\r\n\r\nThe CITR PRO bracket will fit tank rims up to 1.25 thick and euro-bracing less than 0.50 thick\r\n\r\n\r\nSmall:7.25 L x 4 W x 7.125 H (same for both the CITR2 & CITRPRO)\r\nLarge:11.5 L x 5.5 W x 7.5 H (same for both the CITR3 & CITR3PRO)” }