Tetra Weekend Gel Feeder Block 5 days, 0.85 ozTetera Weekend Tropical Slow Release FeederExisting plaster blocks are "old school" technology that can wreak havoc on your water quality! Tetra's innovative new gel feeder blocks contain no plaster and feed up to five days with the Tetra Weekend Tropical Slow Release Feeder. Tetra's feeders provide real nutrition to fish when they need it.Allows fish to eat when hungry vs. plaster feeders that dissolvePacked with Tetra's patented, health enhancing ProCare ingredientsWill not pollute water or negatively effect water qualityGel blocks may be left in the aquarium when regular feeding is resumed,* Allows fish to eat when hungry vs. plaster feeders that dissolve. * Will not pollute water or negatively effect water quality. * Gel blocks may be left in the aquarium when regular feeding is resumed.Powered by eCRATER . List your items fast and easy and manage your active items.