I don't think anyone was trying to really be negative Nicole, they are just telling you the truth. They are also correct. I used to have a lot of fish and Koi are just not good tank fish. Very difficult to keep healthy and alive, and those tanks aren't big enough for them. I realize you are doing your best with what you have, but the truth is still the truth, even if it sucks. Nobody here is trying to hurt you for the most part, as far as I can tell, but it's still correct information, even if it's not what you might wish to hear. Your fish or the landlady's fish doesn't really matter, just keep up with the water changes and try not to overfeed, but it's not a situation where they will thrive and stay healthy long term. Good luck with them, I hope it works out.