hi there i am up grading to a 120x31x35in glass tank i think about 460g uk with sumps as big as i can fit , with 2 weirs with 12000l per hour turn over,would it handle 2in return pipes or two 1half in return pipes in each weir, and may be 6 300w heaters,its for ca/sa cichlids ,i was getting seabray to make it on site and have fresh water miricale mud sumps are they any good or help full to the system any help would be great thanks.i have a 250g uk 8 footer at the mo and it took some fine tuning but runs nice and quite it was made by seabray 2 all pipe work by me. 6 people to lift in, was going for acyrilic for new tank but was told glass is better if you can old tank glass what do u think.... 19mm glass and they can do renforced corners should last forever . ! thanks again