Existing plaster blocks are old school technology that can wreak havoc on your water quality. Tetra innovative new gel feeder blocks contains no plaster and feed up to 4 days. Blended with patented ProCare for optimal health.
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