why is my fish tank color green?

pingu

New member
one of my tanks color is green, its not algy, its like the hole color when green its bazar! i changed alot of the water and it just went back to green after a few days, should i cgange the water almost completly or is there something else i can do? also im going away for 4 weeks for work, i have someone to feed them but what can i do about the water? is it to long to leave it without a water change?
 
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