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I'd suggest a PWC of about 50% to get that nitrite and nitrate down ASAP since you have fish in the tank. Then buy some Seachem Stability and Prime and use the appropriate dosage to get more BB to help you cycle faster.
Yeah, if your aquarium's light is white, then maybe shut off all the lights in the room and put the tubes next to it. Should give clearer color readings since it won't be affected by the usual yellow bulbs.