I read the five-star reviews of these toys and was surprised when none of my four cats were interested in them. I suspect that the only reason for this is the freshness of the catnip. So I will bathe the fish in fresh catnip and this should solve the problem. Maybe you need more catnip than you currently use in the toys.
Other products I ordered: The cat beds are just OK with the cats. The dog bed, however is a big hit. (The round one.) Thank you!