Hello, as the title says I have no clue what I'm doing wrong. Most of my fish have some sort of disease and I cannot figure out what is causing it. I have a established 65 Gallon Tall Aquarium (Been running for 4 and a half months so it better be established) which is cycled (Of course), I have a Marineland Penguin 350 Filter, some sort of Airstone (A little curtain of bubbles) and Air Pump I bought at Walmart (The Pump is on the Filter). I'm using the Top Fin Water De-Chlorinator and am feeding Marineland Color Enhancing Flakes and Wardley Algae Discs, and every few days I'm feeding Frozen Brine Shrimp or Frozen Bloodworms. What I'm using for water changes are two empty Milk Jugs (What I had laying about, washed it before I used it) and a 5 Gallon bucket for cleaning. And am testing with the API Master Feshwater Test Kit. I bought a decent sized piece of Driftwood from Petco for my Bristlenose Pleco and to hopefully lower the PH but only caught at the last second it came from a tank that was "Under Observation" (But I washed it thoroughly with tap water before putting it in my Aquarium). My water Parameters are not fluctuating (Always stay at the same levels every time I test, which is weird, never get any Nitrites but Ammonia fluctuates every so often from .25 ppm to around .50 ppm and get very low Nitrates, but I assume the plants are what's causing it) and am staying on top of my Water Changes (I've been doing Water Changes every 2 or so days for my Tetras Fin Rot, but will go back to weekly once its gone), the Aquarium is aerated enough, no fish displaying signs of it not being. My PH is always around 8.2-8.4 (Its around 7.2 in my Tap Water) which is another reason I got the Driftwood which hasn't done much at all with the PH. My Substrate is Sand and Gravel, I vacuum the gravel every Water Change and bring the sand that is underneath to the top one whenever it looks dirty, that is the extent of my knowledge with sand. I have 2 Bamboo Plants, 2 Anubias, and one Banana Plant (The Banana Plant isn't doing to well). I've had the Bamboo Plants in there for around 3 months, the rest I got when my Aquarium was cycled. I had a Ribbon Plant but I replaced it with the Driftwood I got and it is now sitting on top of my Water Cooler. The fish I have are: 5 Long Fin Black Skirt Tetras 3 Swordtails (Male Red Velvet, Female Red Velvet, Female Neon) 1 Australian Rainbowfish (Will be getting some Females on Thursday the 13th, which is today) 1 Bristlenose Pleco There has been 3 fish that aren't in my Aquarium anymore: Female Red Velvet Swordtail (Before the Swordtails I have now other than the Male, passed away to who knows what) Female Australian Rainbowfish (Same with the Swordtail, I don't know what she died to) Black Kuhli Loach (I only had one and he is now residing in my 20 Gallon Aquarium till I can get a upgrade to a 55 with 3 other Kuhli's) Half Banded Spiny Eel (Died to something, I have no clue, I had another Eel which was sold to me as a Kuhli Loach so I guess died of starvation as I had no idea what to feed him, never found his body and I got the Algae Discs for the Loaches and Pleco) I'm posting this in the Freshwater Beginners Forum because honestly, all these diseases are new to me, and I've never kept any of these fish that I have now before. And am thoroughly stumped to what is causing all these diseases. I do not have a Quarantine tank, hoping to use the 20 Gallon as one once I upgrade. Thank you for reading this very long thread, I don't see what is causing all these diseases and am hoping someone can help me find out what it is. My 2 Female Swordtails have bloated stomaches whenever they eat, so something else is going on.