So I'm new again to tank keeping. A friend of our recently gave us a 10 gallon tank to start for our 2 girls. I grew up having a fishtank and back then it didnt seem so complicated (mind you my parents upkept the thing because my siblings and I were young). So I did what I remembered them doing. I bought numerous plants for the tank, rocks, gravel, a big fancy filter, an aerater bubble, the works. Washed everything, set it up, and left it empty and running for oh...3 days or so. Went to the store, and bought fish. I was obviously an idiot for neglecting to do research first and finding out more about "tank cycling". Anyway. Initially we had 4 guppies (we were told we had males and females but turns out we only had males) a silver molly, a swordtail platy, 2 black skirt tetras and a chinese algae eater. They all did fine for 6 weeks not a problem one. So. We decided we liked the guppies best so we bagged up all the others and went back to the store to get females guppies. We had 9 guppies total, mostly female which is apparently a good thing. Well. As soon as they settled in and got comfortable I noticed 2 of my females acting strange, sitting on the bottom of the tank sluggish an unalert. I figured they were pregnant and didnt worry. Well. They didnt make it. One of my males developed what looked like a flesh wound, but he was doing ok. I figured the filter got him or something. He didnt make it either. Now I have another female in quarantine but I know for sure she has mouth fungis which I'm still unsure how to treat. I've read so much about aquarium salts epsom salts antibiotics methylene blue on and on until I'm losing my mind. I'M SO CONFUSED! Someone please tell me what to do I am so ready and willing to go get whatever I need to save the rest of my fish including the one with mouth fungis. I thought having live plants, not overfeeding, the algae eater, and all that was enough. I've done water changes lately hoping that would help, using the dechlorinating tablets to clean the water (Here in SC they automatically make all the tap water taste like pool water with all the chlorine in it) about 25% of the water each change, I also turned the temp on my heater to 77 degrees. From what I've read that should prevent alot of issues from occuring with the fish but they're still dying. WHAT DO I DO?