great looking tank. quite impressed to see how well 1 bulb lights everything up!
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I change about 40 gallons of water once a month. I know this is too much for a reef tank, but I'm too lazy to change a small amount of water every week, and since my corals are used to it, it doesn't bother me.
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according to advanced aquarist, you've hit the money. They recommend a 30% water change once a month to be suffice.
they found that frequent small water changes are quite useless at removing pollutants and replenishing minerals compared to less frequent large changes