You should also ask what skimmers they have if they are going to make recommendations. As an example If they have a seaclone 100 or a Corallife 220 not sure they are the best person to ask. The best would be someone that has or has had both. I only have a ASM and I am partial to them based once again on price of the G4X being 25% less than the Euro-reef comparable. I couldn't give you an honest personal firsthand knowledge recommendation on anything else.