Welcome to MFK, If you will notice there are many different sub forums. So your question on feeding a jardini would be better placed in the Arowana sub forum instead of the sub forum it is currently in which is Breeding.
Now that your Jardini is getting bigger a single daily feeding would be best also start skipping one feeding a week. What are you feeding your jar? As for tankmates it is recommended that jardini be kept as a solitary fish.