Strong current killed my tetras?

[BelieveInBlue]

bacteria dies roughly 20~30mins out of water so chances are it's all gone. can't really go wrong with stability.

I'd check up on that... I tore down a friends tank, transfered it over to my house, set it up, and added fish to it to cycle, but I never experienced a cycle. The entire process of tearing down, transfering, and setting back up took about 4 hours, and I used the same media, substrate, etc. I highly doubt bacteria would die after being out of the water for 30 minutes, otherwise, the last power outage would've completely reset all my tanks.

As for OP, the majority of a tank's bacteria reside in the filter. That's why you can instantly cycle a tank by moving a filter from a mature tank to a new one. To avoid a reoccurence of this, I suggest running two filters on your tank. There's no such thing as over filtering, and though the tetras do prefer slower moving waters, they don't mind a higher current either. Plus, as mentioned, you can always adjust the flow. By keeping two filters on the tank, you can remove or replace one filter without worrying about a mini-cycle, or worse, a reset of your tank.

[Athomedad]

Definitely check ammonia levels before assuming your tank cycled again. Could be a toxin or disease?

[kid4life]

hmm.. i did a test and everything seems to be fine, but nearly all my fish are dead now other than my plecos and shrimp and galaxy rasboras... for some reason.. they are perfectly fine.. still eat and everything as if nothing ever happened

[Athomedad]

My only thought was that maybe one of the new filter parts/medium were contaminated or you had an aeromonas outbreak. I am by no means an expert but that was my thoughts. Sorry for your loss.

[Gone Fishy]

Hello,

Just my two cents...., bacteria in your filter will not die if kept wet, I've had mine sit in buckets for one, maybe two days!! No ones tank is so clean that there isn't something for them to feed on if sitting in tank water, even with the occasional stir to provide O2. If it dries out, or is not kept wet then your time decreases drastically. I have to agree with the mod, new cycle killed your fishies, I have had neons intentionally group and swim from the output of my FX5, they are quick and built for speed.

Lance