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The main reason I do water changes is to lower the level of nitrates in the water. You need to discard the old tank water in order to do this. If your tank has been established for a while, let's say two months, you will have progressed through the nitrogen cycle, and the ammonia will have been...

Rainbow Lifegard Little Time or Temp Digital Clock/Thermometer I purchased on Amazon in December 2009 is still working well for me. $15.70. Displays temperature in Celsius or Fahrenheit.

In a five gallon I think Cardinal tetra may not do well. I have five Ember Tetra, they only get about 1/3 the size of the Cardinal Tetra; two Sparkling Gouramis, they get about 1/4 the size of dwarf gouramis; two Habrosus Corydoras, they get about 1/3 the size of regular corydoras, and two dwarf...