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it's 1 year plus .
my tank is 100l.Can you please post a picture of your tank?
Also, picture of filtration?
What lights are you running?
Do you know your PAR?

it's showing 0.01 on red sea test.It's the PO4. It's too low.
If measured by Hanna, it's probably 0, since Hanna cannot really measure correctly that low.
Go to the grocery store and add a clam to the tank, and measure again in a few days.
Your PO4 should have gone up by then.
Yes. Carbon and purogenAre you running activated carbon for that huge leather beside it?