I have a 15 gallon tank with 1 spaghetti eel, 3 danios, 1 tetra, and two anglefish. One of the anglefish died last night, and the other died this morning. I took a sample of the water to the nearest petsmart and they said it had an ammonia level of 1.2 when it should be 0.0-0.25, a nitrite level of 2 when it should be 0.0-0.5, and a nitrate level of 50 when it should be 0-40. i just had this water checked about 2 weeks ago and it was perfectly fine. the lady that did the water test suggested that i buy Prime concentrated conditioner for marine and freshwater. She said to put a cap full of it in today and a half cap full in a few days. So i bought it and put in a cap full when I got home. After doing so, a friend told me that it wasn't a good idea to use that and told me to try and siphon it out of the water. So i took some of the water out. Was this a good idea? Is the Prime conditioner a good product to use in this situation? How can I get these levels back down to a normal level?
Thank you.
Thank you.