Hum. Well HQM, so checklist first I think.
-Is there another way to craft it (like a different configuration, or another recipe entirely), or materials that could be swapped out, like oak planks versus modded wood planks, or regular glass versus tinker's glass, or something? (We'll probably figure this out once it shows up as a recipe, but this is good for thought placement for now.)
-Are you sure you only need to make two tanks? HQM doesn't show how many times you need to craft a thing (times to craft, not amount of stuff made) until you mouse over it.
-Did you craft it in a vanilla crafting table, a tinker's bench, a thaumcraft crafting table, AE2 crafting terminal, etc.?
Now, you also said the recipe isn't registering in NEI when you attempt to look it up. May I ask what the crafting steps for this tank are? Just to make sure it's something the in-use version of NEI even has the code to show.