Ok, I’m not doing a 20 long. Its for many reasons such as, it’s cheaper to do a 13.5, it comes with everything but heat, and I can get my toes wet into the hobby before I make any crazy 1000’s of dollars investment. I plan to do 3-4 SMALL fish and some inverts. I’m going to upgrade the flow with a 250g fluval powerhead and I’m going to heat the tank with a fluval m50. I’m going to use reef crystals and rodi for the water and then I’m going to use 10 lbs live rock and 10 lbs Fiji pink for the scape. Weekly 10% wc so i can keep perams stable without dosing. I hope you all can tell me about your experiences with the fluval 13.5 and help me plan my tank to start my journey into the saltwater hobby!