Acrylic Replacement Pad Tiger/Great White Algae Magnet For Tiger Shark &amp; Great White&nbsp;algae magnets 1&nbsp;Adhesive-backed natural felt pad for protection on outer surfaces of acrylic tanks 3 9"x5" acrylic-safe inner scrubbing pads (makes 12 Great White&nbsp;or 12 Tiger Shark pads)&nbsp; 1 Self-adhesive, non-toxic medical grade Velcro pad for holding acrylic safe scrubbing pads on inner