Help my fish are dying

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Your larger tank is probably cycled by now if it's two months (although the cycle could be sensitive; if you take any media out of it to seed the newer tank I'd test this other tank daily too for a week to make sure there are no ammonia spikes from removing the media). The new tank with new filter is the issue as it has no bacteria yet. Just follow the guide that was linked before (it's in my signature below too: new tank with fish), get the liquid API test kit, test water daily, do water changes with a good dechlorinator (Prime is best if you can get it) any time ammonia and/or nitrite are over .25, and/or nitrate are over 20. Good luck.
 
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