My aquarium water has a pale yellow tinge to it. What does this mean?

This could be caused by a number of factors, however it is usually caused by leaching from aquarium gravel or bogwood in the aquarium. Make sure you wash any gravel and bogwood thoroughly before putting them into the water. It can also be a sign of over feeding, so check you are not feeding too much. Always remove any uneaten food from the water, and maintain your aquarium regularly.