The thing with rtc whatever they can't digest will get regurgitated which is a problem with clean water when older but as for the tails they can digest most of it an it will really bring the colors out in the tail and fins. In the wild they love to eat crustaeceans so shrimp tail isn't a big deal and the garlic isn't just any garlic extract from the store it's specifically made for aquarium use and is all organic and safe with all types of fish, scaleless fish, plants, and invertebrates. I use it in all my tanks even my feeder breeding tank
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