Don't start using buffers. your tank can become reliant on them. Try mixing the water yourself. Mix RO water with tap water. Where I live its a rough 50/50 mix but it depends on your local tap water. Mix some up and measure the hardness. If it matches what you need that the combo to use. If it's too hard, use more RO and so until its right

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Reps
1.1.0 leopard geckos
1.2.0 fat tail geckos
0.2.0 Bearded Dragons
0.0.1 Whites Tree Frog
2.0. Crested Geckos
0.0.1 Albino Horned Frog
Other Pets
1.1.0 Border Collies
4.2.0 Cats
Fish
1 Reef Tank
1.1 Parachromis Dovii, 0.0.6 Peacock Bass (2 Orinico, 2 Temensis, 2 Monoculus), 1.1 Crenacichla 'Cobra'

Ihave parrrot fish one peach and one a darker orange they are stunning also have a pleco thats a monster lol great for the tank though they eat all the crap but the parrot fish don't like him much but he handles himself pretty well lol. I used to have oscars which are gorgeous but grow very big you can even hand feed them they are great fish.

Im guessing by 'parrotfish' you mean blood parrots

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Reps
1.1.0 leopard geckos
1.2.0 fat tail geckos
0.2.0 Bearded Dragons
0.0.1 Whites Tree Frog
2.0. Crested Geckos
0.0.1 Albino Horned Frog
Other Pets
1.1.0 Border Collies
4.2.0 Cats
Fish
1 Reef Tank
1.1 Parachromis Dovii, 0.0.6 Peacock Bass (2 Orinico, 2 Temensis, 2 Monoculus), 1.1 Crenacichla 'Cobra'