Or better still, don't spend any money on supplements and let the biological filter sort itself out.
The death of the snail will encourage the reproduction of de nitrifying bacteria and they will multiply on their own. Your tank is looking great considering its young age and I think by the look of those tests and the amount and types of algae you have there, you are about mid-cycle.
It's absolutely fine to clean the algae of the glass, this is normal for any aquarium and is part of daily maintenance.
The biological filter will multiply according to the needs of the system on its own. Adding more "live bacteria" will only prolong your cycle. As the unnecessary bacteria are added and have nothing to feed on, they will die and in turn cause an amonia spike.
It is natural for your tank to adjust itself to increased bio load.
So, When your cycle is done, your water will be fine. When you add your first fish, your bacteria won't cope for a short period until they multiply to a point of balance. In the week or so that this takes, you will have some increased algae and it is wise to do an intermediate water change to help things along.
Apart from essential elements that cannot be replaced naturally, (calc, alk, ect), there is no need to waste any money at the LFS on items that are not fish coral or LR.
If you do decide to use any of these 'wonder products' please do some extensive research on sites other that online stores and supplier and distributor sites.
Keep the updates coming.
