Ok, so I went out and purchased a 20 gallon tank, and I am having some trouble with the initial cycle.... I have read a lot of information on this site and it's great! but I still am a bit confused... Basically, here is what happened... Purchased a 20 gallon tank. I have a Aqueon power filter (charcoal), All glass submersible heater, bubble bar. I was an IDIOT and did not do my research! -Set up the tank, got it running for 12 hours.. stable temp of 77-78 degrees -Used tap water, used Amquel+ to take away chlorine etc.. -Bought 3 Albino Corydoras, didn't acclimate them properly to the new tank. They were all fine for the first few hours -1 Albino died within 3 hours, another one died later that night. Just slowly stopped swimming and started floating around. -Bought a Zebra Danio since I heard they were hardy and good to get the initial cycle going. -Started reading this forum, felt like an idiot.. So now I have 1 Albino Cory and 1 Zebra Danio in the tank. The Zebra was properly acclimated today. He seems fine. The Cory is moving all his fins at the same time and is just staying in one spot near the bottom of the tank. He just really hangs there not moving around much. He still looks fine, and darts a little once and a while, but normally just hangs there in the same spot. I am assuming he is stressed. This is my second day with the tank, and now I am not sure what to do. I want to try and keep these fish around and get the tank cycled. Here are some specs of the tank.. Ammonia - 0 Nitrate - about 10 (based on judging the color on the test strip) Nitrite - 0 Total Hardness - 1000? (it is easily the highest color on the test strip) Total Alkalinity - 300? (it is also the highest level on the test strip) pH - 8.5? (it is also the highest level on the test strip) Temp - 77/78 I have only provided a very small pinch of food to the three Cory's when i first got them, (none of them ate) (Tetramin Tropical Flakes) I gave a super small bit of food to the Zebra Danio today, he ate a good bit.(Tetramin Tropical Flakes) I also had the bubble bar on nonstop, and it seems the two fish like it better off. Should I leave it on? I am just not sure what to do now. Should I worry about the super hard, super high pH levels? I'd rather just get fish that can acclimate to those levels. Should I cycle out some water during the first few days? How often during this beginning stage should i change some of the water? I just dont want to kill these last two fish, and I want to get my tank going properly. Any advice would be AWESOME!