I am about a fairies-fart away from building my own AIO. I watched a youtube video and they made it look FAR TOO EASY. I have structural engineering experience and a full workshop to cut and create all of the relevant pieces. What I lack is the fluid dynamic insight. I plan on creating a 48x24x20 with a 5 inch divided baffle for the filtration that will span 30 inches of the rear for refugium. I do not know what type of silicone is the best, if a lid is necessary, or much anything. Does anyone have a place for me to start?