The amount of water evaporation sounds about normal I lose about 5 gal every 3 days on a 46Gal do you have a skimmer running maybe smell of the waste from the skimmer.....MH might be to close to the surface of the water!
How old is the tank??? Is it still cycling cause I had some funny smells when my tank was still cycling!!
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500G Mixed Reef

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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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