[geodaryl]

What substrate do you have? -are the plants able to take up the nutrition from the tank.
What are the plants you are using? I find the easiest plants to keep are the more robust ones like java ferns and anubias. The plants with larger leaves also tend to do better in my tanks as the thin little leaves of other plants just break off and end up littering the whole tank...

Also, its not really a good idea to keep goldfish with axies as they may nibble the axies gills and cause stress/illness plus the axies may try to eat them and choke etc...