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Eco-Biological marine Reef & Fish tank OBJECTIVE Design an eco-friendly marine tank (zero-water change) system with a biological filtration using mainly discarded materials. DESCRIPTION Dual tanks of 6ft length, 3ft height & 2ft width A dual tank system (corals and free swimming) with a singular biological sump that is virtually maintenance free. FINDINGS Chiller Biological sump tank B A C Approved SMA logo in colour The plenum base was made from discarded materials and found to be effective in cultivating bacteria for maintaining water clarity. A discarded, damaged protein skimmer (removes fish & coral wastes) was made reusable by using rubber bands as a seal. The florescent lighting was enhanced using kitchen foil. A: Creating the plenum base using discarded materials. B: Discarded basket and pipes cut to construct the foundation base. C: Reusable protein skimmer using rubber bands. Students: Charlene Chia, Daniel Chiam, Alan Mai, Maria Josephine Koa, Leon Ong Supervisor: Capt Frederick James Francis (Advisor, Singapore Maritime Academy Club).