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I may be switching from a 10 gallon to a 20 gallon long. I am still working on cycling (second round with tss). If I do switch I have a aquaclear 30 filter so that would be fine. I currently have gravel, but I want to get cories and not lose my whole cycle. Should I just transfer the gravel I have a cover it with sand to keep the bacteria and also have a more Cory friendly substrate? Would I just transfer the water from the 10 gallon to the 20 gallon and then add and do a good water change a few days later? I have 3 platies and a Molly right now. If I did this I would want to make sure the new tank was cycled correct and then add fish? Also I should I wait for my 10 gallon to cycle and then switch or just switch and make sure the 20 gallon cycles? I have 2 days left or the 14 day tss cycle. pH -7.8, ammonia 2-4, nitrites - 0, nitrates - 5-10. After the 14days I will do a 50% water change and that is it. (Side note: how does everyone get the waste off the gravel wirhwit stirring it up? I want to do that but not disturb the gravel this early in trying to cycle). I will be getting pygmy cories so how many could I add at a time with a 20 gallon and not mess up my cycle. I have been having trouble cycling so I am nervous about doing this but I am really enjoying the hobby and want to be able to have more fish.