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Old 12-04-2013, 07:04 PM   #1
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When to top off with saltwater vs plain RO?

I'm a newbie so please be gentle I know that I'm supposed to use plain RO water when topping off evaporated water. But I am going to be getting some new coral this weekend and between the acclimation and dipping processes I will probably be removing about 2-3 gallons of water from my tank. I have a 29G Biocube that with the LR and actually water capacity is probably about 22G of actual water. So if I'm removing about 10%-15% water or 2-3 gallons should I replace the tank water with saltwater or plain RO? Is there a percentage cutoff where saltwater should be replaced vs plain RO?

Thanks.
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Old 12-04-2013, 08:12 PM   #2
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Ive always based mine off of the salinty readings. If the salinty is low i add saltwater, if its good or high, i add ro water
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Old 12-04-2013, 08:28 PM   #3
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general rule of thumb should be if you are PHYSICALLY removing water, replace it with saltwater, the only time you should be replacing with ro/rodi water is for evap. nothing else.

obviously you need to keep the SG in check so you'd want to add/remove sw to keep it stable
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