you'll be fine
4 weeks will be fine. Just do one before you leave and do one when you get back. I only do a 10% change every 4 weeks as well. Just make sure your food portions are defined for your neighbor which will ensure that your tanks do not get overfed.
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If people don't die, it wouldn't make living important.
And why do we fall? So we can learn to pick ourselves up.
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