Tapwater pH 7.8, otos require 7.5 or less
I have a new, heavily planted tank (4 weeks, ammonia 0 ppm, nitrites 0 ppm, nitrates 40 ppm) and I have 6 otocinclus, 2 guppies and a nerite snail, all added over the last 14 days, never more than 3 fish at a time. I've been using Prime and Stability.
But my concern is that both my tapwater and my aquarium water show a pH of 7.8. That's within range for everything but the otocinclus, for which 7.5 is the top end. I plan to add some driftwood for both esthetic purposes and to lower ph, but I'm worried that if it goes down, water changes will make the pH fluctuate. I'm also worried that if it doesn't go down, the otos won't thrive. Any suggestions, for either scenario?
Johnny Relentless, Marina, CA
Tanks: 2 low tech nano tanks, 2.5 gal each
Lighting: 9 watt LED, 6500k
Plants: Wisteria, Pogostemon stelatus octopus, ludgwiga repens, ludwiga needle leaf, cabomba furcata, rotala rotundifolia, bacapo caroliniana, Pygmy chain sword, Anubius bernatali nana, Dwarf sag, Java moss