Your post bothered me all day today..
Something in the back of my head was bothering me and thats one thing.. have you considered the weight? the only measurement you gave was 3 feet from the wall to the end of the feature wall. To me that means that the "short" side of the triangle will be 3 feet by 3 feet by 4.27 feet. Guessing what the highth would be i would guess just to make it easy 3 feet tall is ALOT of water. and alot of water = alot of weight. If my math is right thats about 13.5 cubic feet of water weighs 842 pounds. I dont know how your house/appartment is constructed but thats alot of weight on whatever material your floor is made of..
just some extra worry for you
here are some handy numbers i pulled out of my little black book of info
one liter of water weighs 2.2lbs
one gallon of water weighs 8.35lbs
one cubic foot of water weighs 62.4lbs
one cubic foot of water contains 7.47 gallons
so your fish tank would have about 100 gallons
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