the tetras I got were in a tank that had 7.2 ph whereas mine is just 7  but am getting some bogwood next week to lower the ph abit  for the bristenose plec when I get one in a few weeks as I got some more plants today and got another water test with results 0 ammonia, 0 nitrite, & 0 nitrate with ph7

for the 3 types of fish I would like they all say they like ph ranges from 6 to about 7.5 max  so 7 seems to be okay and I will be getting bog wood and making it in to suckerd bog wood so it sticks to the glass and will make it easy for me to clean underneath without having to remove much, and maybe some peat balls to lower the ph to below 7 as atm i have gravel and rocks in which is probs why I have a 7ph level, might post pics if i remember.