Originally Posted by Itsonme
oh well one of them has 5.5g tank and i change out 2 gallons of it which is like close to 40% weekly i use spring water since my tap has large particles in it
the other has a 10gal he shares with 4 pepper cory's and a snail i do 3-4 gallon changes weekly and they are both filtered and heated
you may need to find a water mineral replacement. I think a brand is called Equilibrium. If you ask your pet store worker they should know, or someone on here will know. Spring water is very pure and doesn't have important minerals in it, so finding a water enhancer would be great.
Also there are many foods that say "color enhancer" I don't know if those really work or not but it wouldn't to try and see if it makes a difference :]