DIY background (in progress)

How much water will this displace?
 
It won'y displace much more than typical decor in the tank.
 
here what it looks like when curing..
covering the background with wet towel and
i put air stone to a container of water in order to increase the humidity, i wonder if it works..
6 days has passed since i started curing..

cure1.jpg cure2.jpg
 
Nice.
 
*sigh* i need to carve again...
my bro bought a wrong styrofoam, i have to carve off thoes pinky stuff..
after i did that, i heat it with hairdryer so it is more solid..

after that, i glue the main foam to the 2nd foam with silicone sealant,
basically, i just cover the whole area, i used up the bottle of silicone sealant.. *omg*

and i weight them down..

and also here is the tank.. getting ready for the background pretty soon..

glue.jpg glue2.jpg toppled tank.jpg
 
so i glued it in, and let it cure for 48 hours and fill it with water..
tap water pH = unknown
pH in the tank = unknown
i will test it soon..

1.jpg 2.jpg 3.jpg
 
the result of pH:
*the third day*

(left picture) tap water = 6.0
(right picture) water in aquarium = around 7.6
not sure if this is accurate, my pH can read from 6.0 to 7.6 only..

6.jpg 7.6.jpg
 
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