Guava Leaves (Once-off) I produced some Guava leaves as a test from my Guava tree. Washed and naturally dried for 2 months. Tested in my shrimp & assassins tank for 2 weeks. Tested in my guppies, guppy fry, shrimp and ramshorns tank for 2 weeks. Sinks without boiling in less than 5 minutes. Pack of 10 for R35 2 Packs of 10 for R50 All 6 packs of 10 for R150 Cash only. Collection in Centurion. Extract from biotopeone website. "Guava leaves are a great food source for shrimp and fish in the aquarium and many species love eating the biofilm the leaves create. These leaves contain polyphenols, carotenoids, flavonoids and tannins. Carotenoids have been suggested in scientific studies to aid spawning health of both the parent and the offspring. Guava leaves produce less tannins than catappa leaves and last longer in the aquarium before breaking down. If you prefer a lighter tannin color try Guava leaves. They can be boiled for a few minutes to help them sink right away if you prefer. Shrimp will enjoy feeding on the leaves after being boiled for several minutes."