Hi, Welcome to Fishlore. The best advice I can give is to start doing 50% daily water changes instead of 25%, and add a water conditioner called Prime when you do so which will detoxify the
ammonia in your tank for 24hrs. Prime should be availible at your
LFS. This will slow your cycle but give you a better chance at keeping your fish alive. Glad to hear that you've done all you can to fix things. Everyone makes mistakes to start with, it's how we learn! You'll get heaps of great advice on this site, anything you're not sure of jusy ask! Good Luck!
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