tank wont cycle????

a friend of mine has a nano tank and has had it for nearly to months.hes got a lump of live rock and a chromis.yet the tank has not begun its cycle for whatever reason.i am not sure of the parameters but will ask.any suggestions??

 

How do you know it hasnt cycled if you do not know the parameters?
Definately need to know that as far as cycling and answering your question

 

because he knows but i dont.he assures me that no levels have budged

 

Cool cool.. so has it not spiked yet (left 0).. or has it spiked and not coming down as far as budging

 

If those have been in the tank for several months, it has cycled. Take the water to the LFS and have it tested. Asuming everything's in range it cycled and his testing supplies may be defective.

 

He said near two months.. depends on how near.. but 6 weeks and 8 weeks does make a difference. I agree with trelane, possibly have an LFS test the water. With the rock and chromis it should have cycled.

 

one week short of 2 months he said so 7 weeks. and no it hasnt spiked hasnt even budged.????:

 

It probably cycled without his knowledge the first couple weeks..... Tanks just don't cycle. it is impossible and improbable.

 

The only way that I can see this possibly happening is if your friend has changed the water daily since the tank has been set up. Could be that your friend is full of beans though

 

Well, it is possible. Improbable, as stated, but possible. My tank has, for example, never shown any levels of nitrites. Ever. Ammonia yes. Nitrates certainly. But no nitrites. I know they are being made and knew it when the cycle was commencing, because the nitrates were rising as well. So if that rock had enough bacteria to keep up with the chromis, then zero the levels would be. Pretty rare, but it does happen.