my 20g brackish

I understand it's custom-made. Just don't think a puffer was the best choice of fish for that shaped tank. How many gallons is it?
 
here're the new photos. click photos for larger version.


i've included a photo of the tank with the cupboard door open, a photo of the top of the tank, and a photo of the canister filter and the denitrator behind the tank and cupboard.

ps: the half buried pebble on the bottom right of the tank (front view) was meant to be the 'bed' for the puffer, and he really sleeps there at night.

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Updates!

Fishes include figure 8 puffer, 2 knight gobies and 3 orange male mollies. Because of the denitrator, nitrate remains around 10 ppm.

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