Hello! I'm a beginner fishkeeper with a 20 gallon tank with 2 scrawny anubias plants that have not grown since I put them in there. I think it's probably because they do not get a lot of light, so I am trying to look into adding light to my tank. Are there any definite "don't"s when picking out your lighting fixture? I am looking into something like this. However, the biggest size they seem to go up to is 20 inches, while my aquarium is 24 inches. I considered lamps and LED clip ons. Do LED clip ons provide enough light for medium lighting? Are there any dangers associated with using lamps, such as the light overheating the water in the tank? Thank you for your time!