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Tetra Weekend Tropical Slow Release Gel Feeder Blocks contain no plaster and feed up to five days per pack. Existing plaster blocks are old school technology that can wreak havoc on your water quality! Tetras innovative gel feeder blocks are blended with patented ProCare for optimal health. Benefit of Tetra feeders: provide real nutrition to fish when they need it; allows fish to eat when hungry vs. plaster feeders that dissolve; packed with Tetras patented, health enhancing ProCare ingredients; will not pollute water or negatively effect water quality; gel blocks may be left in the aquarium when regular feeding is resumed. Quantity: 2 packs for up to 10 days of feeding.