Work best on 10 gallon tanks with 20 inches long; with two extendable brackets, this light also fits for fish tank from18 inch to 24 inch long

Min size after assembled with dockig brackets: 18.5” L x 2.7” W, Light body without docking brackets: 17” L x 2.7” W. Tank thickness: No limit to rim size

Configuration: Total 42 LEDs, 30 pcs 6500K white LED, 6pcs blue LED, 3 pcs pink LED, 3 pcs Green LED

Mode: all lights on and all lights off; no timer; light brightness is not adjustable