Yeah I'll be getting the checker for P04 once my kit runs out. The rest of the tests I currently bother with (main 3) don't involve comparing shades of colours...just simple end points so I'll likely stick with ELOS for those.
Regardless of where the levels are at though I went a full day today and barely a green film on the front pane which normally gets it the worst. Progress has obviously been made. Corals are growing faster and shouting 'thanks!'
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