Seachem Prime Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Seachem is the best-performing seachem prime brand in July 2026, moving 25,000 units across 5 ASINs for 52.1% of Top 10 volume. API follows with 18,000 units (37.5%), ahead of Tetra on 3,000 units (6.3%).

With 4 brands splitting the Top 10 and 95.8% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $2.99 to $12.18, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. On the growth side, B0017JFX3C leads positive momentum with ▲ 500.0% MoM growth on 300 units, with B00FOW79US close behind at ▲ 150.0% MoM on 500 units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.