Salt Creep in Aquarium

Salt creep occurs when the water in a saltwater aquarium splashes out of the tank, gets things wet, and after the fresh portion of the water evaporates, leaves behind salt crystals. 

Salt creeping happens when crystals precipitate from evaporating salt solutions.

How do I stop my aquarium from creeping with salt?

  • Minimize surface splashing - If you use air stones or a bubble wand to create water movement, all those rising bubbles constantly bursting at the surface will lead to quite a buildup of salt creep.
  • Put a lid on it - Putting a cover glass on your aquarium will significantly reduce salt creep in surfaces adjacent to or above the tank. It's a lot easier to clean just the cover glass rather than every surface around the tank.
  • Clean your light fixtures regularly - Salt creep and light fixtures are a bad combination for several reasons. One is that salt creep building up on the splash lens reduces the intensity of the light Passing through.
  • Remove the splash lens and either wipe it with a moist cloth or rinse it in tap water. 
  • Use a dry cloth to clean bulbs, tubes, pins, sockets, or any other components that get energized. 
  • Dry any damp components completely before reassembling the fixture and plugging it back in. 
  • Remove valved objects from the salt creep zone - Any valued furnishings, artwork, knick-knacks, doodads, etc damaged or corrosion from salt creep, should be moved a fair distance from the tank.
  • Clean early and clean often - Salt creep tends to build up very gradually, so the more frequently you wipe down affected surfaces, the easier the cleanup job and the better your aquarium and equipment will look. Once-weekly cleanings are usually sufficient to stay ahead of salt creep without having to use too much elbow grease.

Why does salt creep happen?

Salt creep occurs when the water in a saltwater aquarium splashes out of the tank, gets things wet, and after the fresh portion of the water evaporates, leaves behind salt crystals.

Does salt creep lower salinity?

Yes, salt creep does reduce the salinity in the tank. 

Siphon up to 10 percent of tank water at a time and add fresh water in its place to lower the salinity and gravity to the desired levels. Added water should be at the same temperature as the aquarium water. 

Inevitably every reefer gets salt creep and unlike pests, diseases, and algae, it's quite easy to manage. Salt creep is the dried-up saltwater that leaves salt residue on the surface after the water has evaporated. This is why you top off your tank to prevent high salinity levels. The removal is simple.

Is salt good for freshwater fish?

Salt should not be added to a freshwater aquarium. It reduces the toxicity of nitrite to freshwater fish. Salt is a compound containing sodium and chloride (NaCl). It should be that chloride reduces the toxicity of nitrite to fish, so the salt can be added to provide the chloride ions that offer the fish some protection against the nitrite.

Does Aquarium Salt evaporate?

Aquarium salt does not evaporate or get filtered out.

As water evaporates, the salt is left behind. Most aquarists that use natural seawater only keep it stored for a week or two at the maximum. They always have easy access to clean water so they never need to store it.