not sure what substrate is but if u mean sand its 9 weeks old like the tank
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printthread.php?t=9333&pp=40Hmmm...9 weeks old- stiring your sand, being so new shouldnt cause issues.
Gonna think a bit more....
If your sand is less than 3" deep- continue stirring it w/ every water change. It will help prevent issues on down the road. A mature deep sand bed can cause big nitrate spikes if disturbed- but doesnt sound like that is what happened to you.
could it be that filltar / skimmer causeing a smal cycle
Sounds like your tank is going through another cycle with the water change and the substrate (sand) mixing. Another potential issue may be the test kit results....old test kit?
no just bought it last week but all other levels are fine
Sounds like a mini cycle.
That 1 fish would more than likely only add a little Ammonia. I think your testing is off. I would test again, and maybe even get a second opinion. I clean my sand beds in my tanks so I don't hold nitrates or detrius. If you can, when you pour in new water, pour it into the filtering / sump/ holding area. That way it wont blast the sand bed or corals all over, and it will mix with the current water you have.
Another good practice is to simulate Hurricane type weather. I'll take a small PH or turkey bumper and blast the rocks and corals and everything everywhere. Behind the reef and in the overflow. I even stir the skimmer chamber in the sump.
ty all i checked agin to day ill take some up to rs tom and have them check it