only reason i could guess is if you stirred up your sandbed while adding the new water, other than that i dont see anyreason you could get anytype of cycle from changing water,
like i said in your other thread, dont use phosguard with any leathers in your tank, they usually live but sometimes they dont recover,
if you have any prime, add a cap of that it will detoxify the amonia/nitrite just for a bit extra saftey, if you dont have prime i wouldnt worry about it.
do you use ro/di water? what do you feed the tank?
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but what the heck do i know
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