MP40 for sure. One reason being you can save up and add a second which you will want to do anyway and another reason being I'm pretty sure your glass is too thick for MP10s. I bought a used MP10 from a guy running your tank because it wouldn't hold on his glass.
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Ryan
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Current Tank Info: 50g Cadlights/Giesemann Spectra (250w Radium, 2 ATI Blue Plus, 2 ATI Actinic)/2 x Vortech MP10wQD/Skimz SN123/Eheim Compact 3000+
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