Equipment Maintenance Checklist for Reef Keeping

Check that display turnover looks normal and the return nozzles are pushing the expected volume without sputtering. A sudden drop in flow often points to a clogged intake sponge, calcium buildup in the impeller chamber, or a partially blocked return line.

Inspect the skimmer neck and cup daily for changes in foam head height and consistency. If the skimmer suddenly runs wet or stops foaming, look for salinity shifts, a clogged air intake, oily additives, or salt creep restricting the venturi.

Verify the heater indicator light matches the tank's actual temperature using a trusted digital thermometer or controller probe. Reef systems generally do best around 77-79 F, and hidden heater drift can stress SPS, LPS, and fish long before a full failure becomes obvious.

Watch coral polyp movement and detritus suspension to confirm powerheads are still creating broad, chaotic flow. Reduced output is often caused by coralline buildup on propellers or a swollen bushing, especially in high-alkalinity systems.

Remove dark skimmate and rinse the cup and neck with warm water before thick sludge reduces foam efficiency. Keeping the neck clean helps the skimmer maintain consistent waste export and improves air-water contact.

Salt creep around plumbing joints and cable entries can indicate slow leaks or splash zones that will corrode equipment over time. Wipe deposits away and investigate the source before it damages outlets, controllers, or cabinet hardware.

Disassemble the pump and soak the impeller, volute, and shaft to dissolve calcium carbonate deposits that reduce efficiency. Citric acid is often gentler on plastics and seals than strong vinegar soaks, especially for routine reef equipment cleaning.

Use a small brush or dedicated pump tool to scrub inside cages and around the propeller hub. Coralline buildup changes flow patterns, increases heat, and can cause startup issues after feeding pauses or power interruptions.

Look for cracks, swelling, or missing bushings that can cause rattling, poor alignment, and premature pump failure. Replacing these inexpensive wear parts often restores quiet operation and reliable restart behavior.

Turbo snails, bits of chaeto, and loose frag plugs can partially block intake screens and choke flow. Intake obstructions are especially common in mixed reef sumps where macroalgae and cleanup crew animals share space with equipment.

After cleaning, activate feed mode and verify every pump restarts immediately without manual spinning or repeated clicking. A pump that fails to restart cleanly is a warning sign of impeller wear or motor weakness.

Install your spare return pump or wavemaker briefly to ensure it still runs and fits the plumbing or mount as expected. Backup equipment that sits unused for years often fails exactly when an emergency happens.

Salt creep and moisture buildup inside the airline can drastically reduce air draw and skimmer performance. Run warm RO/DI water through the line or soak the venturi parts so the skimmer can pull air consistently again.

Disassemble the skimmer pump, bubble plate, and neck to remove biofilm and calcium deposits that reduce contact time and foam stability. This is especially important in systems running elevated pH, kalkwasser, or high alkalinity near 8-10 dKH.

Mechanical filtration that is left too long traps detritus and can become a nutrient source instead of a nutrient export tool. Swap socks every 2-3 days in heavily fed reefs, or monitor fleece advancement so water does not spill around the media.

Reactors running carbon, GFO, or biopellets can channel or clog when internal screens become packed with fines. Check that media is tumbling or flowing as intended and rinse any compacted sludge from the reactor body.

A cloudy quartz sleeve reduces UV penetration and lowers effectiveness against green water and some free-floating parasites. Follow the manufacturer's wattage and flow recommendations, then clean the sleeve so sterilization performance stays predictable.

Refugium lights lose output when the lens is coated with salt or when cooling vents clog and overheat the fixture. Reduced PAR over chaeto can slow nutrient uptake and lead to unstable nitrate and phosphate export.

Remove the heater and check the glass, titanium shell, and cable seal for damage. White mineral crust can insulate the element and affect response time, while corrosion is a clear sign the unit should be replaced before it sticks on or off.

Compare controller activation and shutoff against a calibrated thermometer and confirm the tank remains within about 77-79 F. Even a 1-2 F error can become dangerous in summer or in smaller reef systems with strong lighting and enclosed cabinets.

Salt spray, biofilm, and snail interference can cause false readings that overfill or underfill the sump. Keeping sensors clean helps maintain stable salinity near 1.025-1.026 SG, which is critical for coral health and accurate dosing demand.

Precipitation, kinks, and weak ATO pumps can slow top-off enough to let salinity creep upward between fills. Confirm water moves freely from the reservoir and that anti-siphon measures are still working properly.

Run each head into a graduated cylinder and confirm the actual output matches your programmed dose. Small inaccuracies compound quickly when dosing alkalinity, calcium, or magnesium, and can push levels outside safe ranges like 7.5-9.0 dKH or 400-450 ppm calcium.

Alkalinity lines especially can harden or clog at the tip where fluid meets air, causing missed doses or sudden spurts. Trim crusted ends and replace tubing before flow becomes inconsistent.

Salt film and dust reduce PAR and can shift how evenly corals receive light across the aquascape. Wipe shields carefully with a damp cloth and keep fan intakes clear so fixtures do not overheat and throttle output.

Use a PAR meter if available, especially for SPS-dominant reefs where small lighting changes matter. Many acropora systems target roughly 250-400 PAR in the upper rockwork, while LPS and soft corals often fare better in the 75-200 PAR range.

Confirm every cord has a proper drip loop and that no outlet or power brick is exposed to sump splash. Test GFCI protection regularly because reef cabinets are humid, salty environments where electrical safety cannot be treated casually.

Clearly mark return pump, skimmer, heaters, lights, and dosing equipment so you can isolate problems fast during leaks, overflowing sumps, or stray voltage events. This also helps anyone tank sitting for you avoid unplugging the wrong life-support device.

Run circulation pumps on battery backup or activate emergency air pumps to confirm runtime and operation. In reef tanks, oxygen depletion during outages can happen quickly, especially in warm water and heavily stocked systems.

Critical equipment failures often happen outside store hours, and reef livestock may not tolerate long delays. Maintaining a tested spare for the return pump and heater can prevent catastrophic losses during an otherwise simple breakdown.