I like to add salvinia (salvinia minima I think) to my shrimp tanks. Helps to soak up excess nutrients and shades the tank nicely, hence I think helps to settle the tank and hopefully find the balance. Then, once the shrimp go in, they love it. Or really easy to remove if no longer needed. I still fertilise my shrimp tanks though even with only the salvinia and Christmas moss in them; not super heavy, but not light either (at about 2x Seachem 'beginner' dose).
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