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 a closed loop is not a " necessity " especially coming up from the bottom like that ... so if a closed loop is something you want and the tank is 30" or less ( front to back ) then utilizing the sides or the back would be just as effective IMO ( I had a 330G for 6 years [96 X 24 X 33 ] with 2 closed loops on the back using eductors and it was very effective ) ... so the cost of a hybrid material build like that will likely be higher than a all glass tank ... is it worth it ? The other thought is that closed loops themselves require pumps that draw alot of amps and until you have actually had the pleasure of paying those hydro bills on a regular basis you may want to consider another energy efficient source for circulation ( ie. the new powerheads that stick on the glass [ cant remember the name the latter comments are part of my thought process for my next tank build which will definately be this year ( 450G ) ... I may plumb the tank for a closed loop or 2 from the start ( in case later on more energy efficient pumps come along ) but likely will utilize the powerheads instead which brings me to the tank builder Bow Valley are not trustworthy ... you can do a search here or on RC and you will get LOTS of hits on the subject ... if it looks like a rat, smells like a rat ... then likely it IS a RAT ( you can do a search under my name here for my experience with Bow Valley as well ) IF you decide to go all glass ( my recommendation ... acrylic scratches too easy and not sure if you can get that PVC combo here in Calgary for a practical price ) then the tank builder I would recommend locally would be Golds ... Albert and Dennis are very good to deal with ( opinions aside ) and they deliver what they promise for the price they promised - they built a tank for a friend of mine and it turned out exactly as specified 
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	Steve “The most important decision you make is to be in a good mood.” ― Voltaire  | 
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			 Hi Steve, 
		
	
		
		
		
		
		
	
		
		
	
	
	Thanks so much for you post! I have been thinking about this quite a bit the last little while and yes, I am caving to the thought of having to use glass for the bottom. I really like the idea of PVC but am just not sure of the implications at this point to go ahead with it…not thinking with my heart here, just my brain. I have had to put the tank build on hold for the moment, Cheers, Theresa  |