Tap water can be VERY bad depending on your local water supply! We prefer RO/DI filtration to ensure the best water quality we can provide.
Brine shrimp unless just hatched, or soaked in vitamins are just junk food.
Feed less or up your filtration, and water changes. I prefer the latter.
I like to feed my animals daily....
We also do not recommend canister filter, we much more prefer sumps.
But you can have the canister just more work involved since you have to clean them at the very least weekly, and if you have sponges or the ceramic noodles get rid of those.
What type of test kits do you have, and what is the experation date on them?
With all your parameters being at 0 you should not have any algae, more precisely slime algae.. Something is not right.
Testing for phosphates unless you have a Hanna meter or one of equal value, or a buddy with one would be a waste of time. None of the less expensive phos. test kits will give correct readings.
PH readings during lights off, or shortly after they come on are less then when lights have been running for a little while. Re-check the PH before you try to raise it.
Always double check any reading that is off before attempting any adjustments.