Hurric

I am now feeding lightly plus I got a second filter. I did put some fish food day 2, not sure whether they started the cycle. I took water sample to local aquarium store, tested with api kit and it’s okay. I will get a api master kit myself and start testing.

Thanks for the kind words. I just got lost a little about what to do next. I went into a local fish store, and they told me my filter is not the proper one. It is the Sicce Nano Micron, which is inside the water. They told me to buy a hang on the back filter which will help. I am not sure whether they are helping or just selling things to me. Need to learn a lot of stuff all at once...

I got really conflicted right now. On one side I am afraid my tank is not readily cycled and the fish died due to too many fish come in before i have enough cycling to support them; on the other hand the remaining 3 keep fighting...

Will my 10 gallon tank be able to hold so many tetras? Also will a new tank be ready to take all of them in together?

Another video link showing all of them fighting: https://photos.app.goo.gl/XWGieXNrket7TZvJ7

I set up my first 10 gallon aquarium about 2 weeks ago. Yesterday I got first fish, pack of 4 Orange Von Rio Tetras(is that right?) from Petco. Before getting the fish I took water sample and got confirmed the water condition is ready. This morning I woke up finding one out of four tetras died. I took water sample to Petco again and confirmed again water condition is not the problem. Now with the 3 tetras left, the bigger one keeps chasing others non stop, to the point the two smaller ones are always in the corner bumping into the glass. One of the smaller ones also is constantly in a weird slightly diagonal position, bouncing up and down. From my understanding these tetras are schooling fish, why is the bigger one keeps fighting the other two? It seems it has created stress to the smaller ones and I am at risk losing more? Video link (hopefully it works): https://photos.app.goo.gl/1DiayAs9qVHeWACV7 Any help or advice is appreciated.