The directions on the package say to add 1 to 2 tabs per plant once a month.
I have a 29g planted aquarium and within 24 hrs of inserting just 2 tabs well below the surface of the gravel my ammonia level spiked beyond the 8.0ppm on the Master Test Kit chart. Probably not worth the risk of harming livestock by using this product.IF YOU USE THIS PRODUCT YOU'LL BE SORRY!
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