"Spot" is a 7" JAPANESE IMPORTED YAMATO NISHIKI. My Gift to self for finishing my DIY 250 GAL pond filter. STAGES: 1RST Wet/Dry Mech/Chem - 5 chamber trickle shower (brushes, matala, lava, k1, bacti twist, charcoal, oyster shell). 2ND Bio/Mech - Up flow to 50 GAL tank w/ static k1 & matala opens to grated planter. 3RD: Bio – Flow down to 100 GAL tank 1/2 full of k1 air boiled w/ powerful blower. 4TH: Up flow to large grated planting area and out to pond. 5TH Separate loop for UV.