THREE MALTA PLANTS ARE MORE THAN 1 YEAR OLD AND SMALL FRUITS ARE ALSO BEING OBSERVED.SHOULD I KEEP THE FRUITS TO GROW OR REMOVE?
We don't make product recommendations, but this article should help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/types-of-organic-fertilizer.htm
I didn't find any information on malta in my research. You might try contacting a nursery near you or the one where you purchased your malta.
This article on citrus may help:
https://www.gardeningknowhow.com/edible/fruits/oranges/growing-an-orange-tree.htm