Evansimp
Aquarium Advice FINatic
20 long in my opinion!
Also, I had 120 watt LEDS over my 20 and my corals loved it! I had the lights about 12-16 inches off the tank. As long as you have them far enough away from the water you're fine!
Also I didn't have a skimmer on my tank and it was totally fine so I don't think it's needed! On smaller tanks I think it's better to just do water changes weekly! Hope this helps.
Also, I had 120 watt LEDS over my 20 and my corals loved it! I had the lights about 12-16 inches off the tank. As long as you have them far enough away from the water you're fine!
Also I didn't have a skimmer on my tank and it was totally fine so I don't think it's needed! On smaller tanks I think it's better to just do water changes weekly! Hope this helps.