There's two versions of the worm item; the ones you can get from Water Strainer's worm bin and trowels, and the kind you can get from Aquaculture 2's worm farm. Of these, the Water Strainer worms are much easier to get (the worm bin processes compostables very quickly), but also appear to be useless (despite the description, they can't actually be used as bait with Aquaculture rods and tackle boxes, unlike Aquaculture worms, and there's no other use for them).

I suggest that there should only be one kind of worm in this modpack, and all sources of Water Strainer worms should produce Aquaculture-compatible worms.

I just realized that the purpose of Water Strainer's worms are as bait for the Water Strainer in fishing mode.

Though reasonable, this is still rather confusing, and having only one type of Worm that can be used in either recipe would make things more straightforward.