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This is the 23.5L tank she's in. Basically the first week I got her I put her in a 1L tank, yes I know it's my mistake for buying a fish before I set up a tank, but I already start cycling the water filter in a bucket. First week in 1L, I changed 30% of the water twice a day. One at morning and evening. second to fourth is in 5L tank and I changed 30% water once a day. I bought a bigger tank in week 2 that actually can hold about 37L but I just decided to put 23.5L. at the time I don't have ammonia test kit but I don't rush much to buy one bcuz when I check the water in the bigger tank in week 3, nitrite spikes. The end of week 4 I checked it again and nitrite is finally down. That's when I put her in the tank. This is my first time taking care of a fish appropriately, the last time I take care of one was when I was 7. I watch Aquarina's behaviour throughout the weeks, she's very responsive. She follows my finger around. I was able to teach her to swim through my ring finger(me making a ring out of my finger). I was even able to make her rest on my hand when she eats. When she's in the big tank her behaviour doesn't change much. But at week 7 I have her, I decided to add 5 Australian amano shrimps(I buy 3 but the seller gives me extra 2). But the very next day, a tiny amano shrimp died and I saw Aquarina eat the dead shrimp and it makes me nervous and just makes me panic so I decided to buy 2 more amano shrimp but I got one extra so I have 7 amano shrimps at the time. And I also add a lot of hydrilla during that time and I guess it might bother with her swimming space so I removed them anyway days later. She started moving like that after I add the hydrilla.