Hey everyone just got this frag house built for the 20 gal long frag tank i am doing. Would like opinions on it and suggestions will have a live rock scape on the left side of the tank for bioload few fish and cuc. Was trying to build tiers to help with coral placement for lighting and flow as well as a good flow system for no dead spots throughout the frag rack. Suggestions for substrate if any or power head would be awesome. Or even suggestions for the rack i have plenty of egg crate and risers to do whatevers needed just trying to get the best arrangement for it as possible. Sanded all edges of egg crate for live stock purposes and also for no cut edges that could possibly do damage.