Well I'm not sure if it was less or not, I just tested a week later to see where I was. I put some bioballs in another tank so I always have bacteria available, plus my sister has an Aquaclear 50 so I can steal some bacteria too lol.
So my tap comes out at like 8 pH and my 5.5 is at 6.2 with the Fluval stratum and CO2 running 24/7 and an airstone at night
Just a thought, do you think this powerhead is too powerful for a 15 gallon long tank? Hydor-Koralia-Nano 240 GPH? couldnt link it. I'm having dead spots and its causing algae and it looks like it belongs there.