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Existing plaster blocks are “old school” technology that can wreak havoc on your water quality!Tetra’s innovative new gel Vacation 5 Day Feeder blocks contains no plaster and feed from five days with the TetraWeekend, or to up to 14 days with the TetraVacation.
On August 29, 2007:This is the best vacation feeder. It lasts longer than stated even with more fish than recommended. It doesn't cloud the water at all. The fish just casually stop by once in a while to take a few bites.