If you use 1 cocktail sized shrimp per 30 gal
then you shouldn't notice any smell.
Leave the shrimp in till your cycle is done (nh3
spikes then at 0 ppm
) and remove if any is left after the cycle.
I'd leave your lights off which will help keep down algae blooms but other then cleaning the glass I'd leave them alone.
Don't use AC
or Purigen. Purigen absorbs nh3
and would slow down or keep your cycle from happening.
I would add another PH or two for better circulation aiming them towards the surface (slight ripple) and at each other from opposite ends of the tank for good oxygen exchange and convulsing currents.
Is the filter HOB
or canister? Purigen works best in canisters where water can't bypass the media but will work in a HOB
filter but not as effectively since water doesn't go through the media as thoroughly.