Hi! If someone could please help, it would be greatly appreciated. For Easter I purchased a male beta for my daughter who is enthralled by fish. I've had betas before, no problem. My last we had for five years. This beta was purchased from a local pet store, all my previous were from a chain pet store. The new one died in like 5 days. So we went to a chain pet store with the intent to buy a new beta before she could notice. She was thrilled with the fish tanks and watched them for ages. My husband and I decided to get a fish tank and keep fish. We purchased a complete 10 gallon tank with whisper filter, heater, gravel and accessories. We took it home, set it up, filled it with treated tap water, and let it cycle for a week, as per the instructions that came with the freaking tank. We went back to the pet store, chain again, and based on the advice of the fish person there, bought 4 mollies and 2 platies. Brought them home, introduced them gradually and properly, everybody was happy! About two weeks later, we noticed one of the mollies had had babies. Only two were left at that point, not sure how many she had to begin with. I scooped them up into the net and let them stay in there while I figured out what to do. A few days later, the mommy died. Then the separated babies, then the daddy, etc until all the fish were dead. I removed each dead fish right after noticing. So we took apart the tank, cleaned everything and let it rest for awhile. We then started over. Filled, treated, cycled for a week, went back to the pet store. This time we purchased a male beta and 3 glofish. Once again, introduced properly, fed right amounts......less than a week later, all dead. I don't know what we're doing wrong. We did partial water changes every week with the first batch, didn't even get a chance with the second. My test strips the first batch indicated that the water was a little hard and just barely alkaline. Second batch every reading was in the normal range. First batch the tank recieved no direct sunlight, just indirect light for a few hours in the am, second batch I moved it so it recieves no sun at all. Any and all information would be so helpful as I really want to make this work. My daughter keeps asking where her fishys are!