Best Large Aquarium Setup: Canister Filters, Heaters, Lights and Stands for 55 to 300 Gallons

Canister labels list pump flow with no media and no hoses. Fluval publishes both numbers for the 407: 383 GPH on the pump and 245 GPH through loaded media, about 64%. Plan on two thirds of the label.

For fish, 5 turnovers an hour is the middle of the usual 4 to 6. A 55 gallon holding about 51 gallons of water needs about 254 GPH at the tank, so look for 390 GPH or more on the box. A 75 gallon planted tank at 7x needs about 720 on the box, and a 125 gallon at 5x about 800.

On tanks of 6 ft and longer, two canisters at opposite ends beat one big one: no dead corner, and the tank keeps filtering while you clean one.

Heat takes about 0.3 W per gallon for each degree F the tank sits above the room. A 75 gallon of fish 8 F over a 70 F room needs about 160 W; sized for a cold night at a 10 F lift it is about 200 W, which two 100 W heaters cover.

Two heaters split the risk. If a thermostat sticks on, half the wattage warms the tank half as fast, which gives you time to catch it. If one dies, the other holds the temperature up. On anything over about 75 gallons, add a plug-in controller with its own probe so a stuck heater gets cut off.

Big systems and sumps often use titanium elements, which have no thermostat and must run through a controller.

A fish tank light only has to look good and run on a timer; buy one whose brackets fit your tank length. Long tanks take two fixtures end to end: two 30 to 36 in lights cover a 6 ft tank.

Planted tanks need real light at the substrate: about 15 to 30 PAR for anubias and ferns, 30 to 50 for most stem plants, and 50 or more for carpets. A planted-spectrum fixture like the Fluval Plant 3.0 reaches the middle range on a 21 in tall tank.

Match the stand top to the tank footprint and its rating to the filled weight with room to spare. A 75 or 90 gallon on a 48 x 18 footprint weighs 900 to 1,250 lb with water, substrate and rock, more than many 48 in stands are rated for.

Shim the stand level before filling, keep it off carpet if you can, and on a wood floor set the tank across the joists near a load-bearing wall.

Past about 90 gallons most builders go rimless, low-iron (starfire) glass with a built-in overflow, and put the filtration in a sump under the tank. The glass gets thick: 12 mm on 24 in tall tanks and 15 mm above 30 in.

These drilled tanks ship with bulkheads and plumbing kits; budget for the sump, the return pump and the stand. Our calculator sizes the return for a sump instead of a canister when you tick it.