Why does my aquarium have white crust on the filter?

Answer by  abby39 (213)

The white crust is lime deposit that comes from the water you are using. The lime deposits come from heat and evaporation. Using soft water or bottled water can help reduce the deposit, but be careful not to disrupt the pH of your water. You should be testing your water quality once a week.

Answer by  Tank (539)

The white crust is most likely salt creep. Its an excess build up of salt that is from evaporated water. You need to clean that at least once every 6 weeks depending on how serious the buildup is. Try not to spill any into the tank and make sure you give the edges a good cleaning.

Answer by  callie13ly (109)

The white crust are mineral deposits which are left after the water evaporates. These come from the hard water you are using in your tank. to prevent this build-up try using bottled water or treat your wate prior to putting it in the tank. The same deposits can be seen usually on the sides of the tank at the waterline.

Answer by  marns (77)

The white crust forming on the filter is minerals that have accumulated due to evaporation of water over time. The minerals left behind have built up leaving behind the crust that you now see.

Answer by  sam805236aolcom (267)

That white crust is calcium deposits from your water. If you want to get rid of it, use DI (de-ionized) water.