James,
Marimo balls are quite ok with goldfish too. Line the bottom with big and small ones can be nice and costly. They are effective filters too if you wash the dirt off them on your weekly water changes.
Oversize your filters and add lots of bio media. This is needed to convert the ammonia into nitrate quickly for planted tank with goldfish. Dose more KH2PO4 to match that NO3. Match that with sufficient daily Excel (Goldfish do better in alkaline water so CO2 and coral chips are poor companions) and low to medium light, and you should be doing ok with just 50% weekly water changes.
2 Goldfish is enough for a planted tank, don't be tempted to add more fish, add more plants instead. If you give your fish sufficient boiled lettuce and spinach daily, it will not need to graze on your tough anubias.
Enjoy.
Warm regards,
Lawrence Lee
brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable--if anything is excellent or praiseworthy--think about such things.
Philippians 4:8
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