My first suggestion is find out what they are. Are they silvery in colour? Do they seem to jump/spring into the air when you blow on them? If so they might by Collembola (spring tails), which are harmless. If so, spraying your plant with alcohol is just going to stress your plant without need.
The other thing is, if you are still not sure what it is, take the plant out of the hydroton and boil the hydroton, then replant.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
Goblin Market
by Christina Georgina Rossetti
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