okay so i want to have a school of tetras but i have hard water my PH is consistently 7.2 and i don't want to adjust it constantly- I've tried that in the past it's futile the water goes back quickly and the osmotic stress on the fish isn't worth it. I already have some black and white fish so i was hoping to find a colorful tetra. any suggestions? (community compatable too)or is it a lost cause?thank guys