True, but if the shrimp have ich they are screwed anyway. If op doesn’t have qt tank, just remove the inverts and put them in a Tupperware floating in main tank, and dose the tank.Shrimp tend to be very fragile. I would suggest taking your fish out of the tank rather than your shrimp! There aren't really any ich treatments safe for inverts... supposedly, garlic and melafix are "invert-safe" solutions, but there is controversy over the effectiveness of these products. Also, the main tank wouldn't have to be medicated or the filter tampered with!