Alright here's the thing I'm setting up my 210 with a hydrive pump rated at 1800 GPH that has one ocean clear and one nuclear canister filters in tandem. I am hard plumbing the system but, from different reputable sources one source says that I don't have glue the system since it will be a low pressure system. But yet other sources laughed at the fact that I'm listening to that option. For me I think it is really risky if I don't glue it but, this source that told me I don't need to glue has some 30+ years of experience under their belts and large successful operation(s). I'm also stumped if I should place the pumps before or after the filters... Any opinions or help would be greatly appreciated!