Quote:
Originally Posted by Koresample
Is there any kind of 'rule of thumb' for adjusting the HG level when you are trying to make small changes?
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The 'rule of thumb' is to not ever have to adjust your Specific Gravity. It should stay very VERY close to where you want it... large changes like what you've described above would kill or at the very least heavily stress many of the less hardy types of creatures you will likely want to keep. The ocean is a very stable environment and doesn't change that much, which is what you should strive for... stability.
And I agree with MCC about the fluval. I would empty it and use it to circulate the water, nothing more. There really is no need for a filter like this in tropical saltwater tanks, that's what your rock and sand is for.