I know from aquaponics tomatoes and peppers having a lack of iron will yield yellow leaves.
However the usual cure for that in aquaponics is chelated iron, which wouldn't work in a salt tank, also itd be complete overkill here.
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55g w/ DIY overflow and skimmer, 25g cube (under construction)
Its a tad hard to play with your aquarium if you cant lift more than a gallon of water...
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