I tested this product 14 days before my trip and surprisingly it worked well. There is also a huge amount of sheet feed units in excellent condition. Now it's time for my real 21 day vacation. I cleaned my tank 3 days before the trip and then added a holiday food block to a safe place in my tank. So he had to work a total of 24 days. When I came back my tank was in great shape and still had food in it. The downside was my air filter under the gravel which was very dirty and there was a layer of white food powder visible on my stones but that's fine, I usually clean it every 21 days. My tank is 2 1/2 gallons, 34 inches high and 6 inches in diameter. It also has a long-rooted pothos plant and is home to a community of 5 fish. I also covered 98% of the upper with Press-and-Seal to prevent total water loss. I figured that at the rate of water loss in my tank (about 1/3 inch per day) combined with the Holiday Feeder feed block would mean an instant thick soup in 24 days. But the press plug and sealing of almost all water/evaporation losses and leaf feed worked well.
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