In theory you should not need to add bacteria solutions once your tank has established a stable cycle... the natural beneficial bacteria colonies should be able to adjust and maintain their population based on the bio-load.
Though if you increase the bio-load by adding alot more livestock or add medications or do more extensive tank/filter cleaning, then it can be beneficial to dose some bacteria solutions help in maintaining the cycle.
As for your otos, they will eventually learn to eat algae wafers, some learn faster than others. Once they recognise the algae wafers as food (along with fish and shrimp food too), you will see the otos swarm to the wafers and pellets as soon as you drop them in.
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