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A few random pictures from the past week or so

Beautiful. What does ec 21 stand for?
conductivity. Nearly all tds pens are really just ec pens - so this is sort of like a tds of 10 1/2. Very soft water.
 
A couple of caves from my aquarium:
ca4.jpg
and a bit of light:
ca2.jpg

and
ca1.jpg

ca9.jpg
 
That’s one ugly creature! A face only a mother could love.
 
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What is the evolutionary advantage of having the hump on the head? Any ideas?
 

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