looks like dried almond leaves, antibacterial, good for shrimp breeding too, soften water and makes it slightly acidic.
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15G Planted Aquarium of Red Cherry Shrimps, Crystal Red, Black Shrimps & cute dwarf puffer. :p
50G Planted Aquarium of 6 Goldfishes, 2 Weather Loaches, 4 Silver Cories & 1 Pleco.
20G Planted Aquarium - Emerald Green , Tiger & Blue Pearl shrimp tank.
10G Office/Lab Planted Aquarium with Neons and Galaxy Rasboras
5G Hexagon Aquarium of baby Goldfishes.