Since most of the negative comments here don't explain why this product didn't work for them, I would take their reviews with a grain of salt. I have used this product on 7 different tanks and it has worked for me. I use SL-Aqua active primer and ADA Revineia. The nitrogen cycle was much faster with SL-Aqua (completed in 2.5 weeks). Revineia needed an extra week. I haven't lost any plants or fish or shrimp. I used this on new starter tanks, not existing ones.
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