Never heard of that brand, or adding aloe vera, but the most important part of the conditioner is the dechlorinater, everything else is just trying to sell you more than you need. If you do your water change by buckets, then you only dose the amount of water in the bucket(maybe 15 to 20l volume) before adding it back to the tank. If you add tap water directly to the tank maybe with a hose, then you need to dose the amount of the whole tank (300l)
The beneficial bacteria, if it works, is only really useful when starting from scratch, but your old tank has been running awhile and should be fully cycled, a test for nitrite and nitrate should confirm this. Use your old filter, or at least media from it in your new tank and you will get the beneficial bacteria you need already.