the purpose of changing water out of a tank is to reduce the quantity of nitrates, nitrites, phosphates, and ammonia.
When water evaporates it does not take any of these chemicals with it.
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100 gal touch tank for propagation;Current Sunpod2 HQI @1400k HQI ,38 gal Korrall sump, ASM G-3 skimmer, Mag 9.5. Stock changes often
125 gal ;Aqualight Pro HQI 2 HQI@1400k / Compact Fluorescent/Lunar Light Fixture, 5 powerheads, 30 gal sump, mag 12(return),Ocean runner 3500(return through chiller), ASM G-3 skimmer, UV sterilizer, Artic chiller Tobacco bass, maroon clowns, Seriatopora guttatus, Seriatopora hystrix, capricornis, Acropora, Spongodes, porites, Turbinaria,Stylophora pistillata, etc
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