I use the Aquarium Coop tabs in my shrimp tanks as they are copper free but I prefer these solid Seachem root tabs in my other tanks as they are much easier to handle being a solid/pill form, not a gel tab. The AQ Coop root tabs hold air and tend to float up out of the substrate so you have to press them in really deep. Overall, they are hard to handle but the Seachem root tab product design is easier to handle. The concern with the Seachem product is the trace amount of copper which can be an issue if you have invertebrates though, to be honest, I think the amount of copper in the Seachem tabs is so small it will not be cause for concern. Overall, I really like the Seachem product.
I have used the Seachem root tabs for a long time. I started getting them from the Coop because my LFS does not sell them in bulk. My plants have always had good growth using these root tabs.
As always great service from aquarium co-op. Great price and fast shipment. As for the root tabs, they are easy to handle and insert into the gravel. But it's only been 2 days so I can't say how effective they will be. My substrate is organic potting soil, but it is 7 yrs in the tank and no ferts added in 4. I expect good results.
Solid product easy to use and effective
Really cool i can buy just the amount i needed 1- whatever