Tetra - TETRA VACATION 14DAY FEEDER.Now You Can Feel Safe About Leaving Your Fish When Traveling. Existing plaster blocks are "old school" technology that can wreak havoc on your water quality Tetra"s innovative new gel feeder block contains no plaster and feeds up to 14 days with the TetraVacation. Blended with patented ProCare for optimal health.-1.06 oz