Hi my name is Martin and I have been reading this forum for a few months now. So thought it was about time I repaid with some input. This is my only tank and its 72"x 36" x 18" but the water depth is 27". This is because it is filtered with a Tunze filter system which fits inside the tank above the water level. It to has been going for the life of the tank, I have renewed the motor bearings once during this period. I replanted it two months ago and started the EI dosing system which as you can see is working well. As it holds 530lts of water I am dosing with 45grams of KNO3, 6grams of K2SO4, 6grams of KH2PO4 and 63grams of MGSO4 per week split into three, also 60ml of TPN with a 50% tap water change every week. CO2 is pressurized from a 3.2KG bottle and pushed into the green with a drop checker with 4dh water, the bubbles per sec to get there is about 5+. This is because it has a high turnover and open top with a surface skimmer which is part of the Tunze system. The gas is on a time switch to switch on only when the lights are on. Lighting is an Arcadia series 4 pendant with 3x150w 5,200k MH lamps and 2 x 80w T5 pro plant tubes. They have separate timers and the T5s are on for 12hours and the MH lamps about 9hrs. I have not added any fish for about 4years now, however I have a population problem. They just breed too well. Swordtails and bristlenose babys are always appearing. There is also Clown loach, Buenos Aires tetra, Congo tetra, and a few others that appear at feeding time.