I have struggled with high pH and high alkalinity. My nitrates are through the roof too! I don't have any fish yet! Petco advised me to remove all of the water and replace it with natural spring water. I tested the spring water before adding it to my aquarium and the readings were perfect. After 24 hours I tested the water and my readings rose again. I did some research to see if other customers are experiencing the same thing as me because of the AquaNatural Diamond Black gravel in my tank. I will drain all the water again to remove this gravel.
πͺ¨ CJGQ Black Pebbles for Plants 7lb - Bulk Bag of Aquarium Gravel 1-1.5 inch - Decorative Polished Stone for Fish Tanks - River Rocks
9 Review
18 Pounds of Natural Polished Decorative Gravel - Pebbles Aquarium Gravel River Rock - Mixed Color Fish Tank Stones - Garden Ornamental River Pebbles Rocks - Polished Gravel for Landscaping (Multicolor)
8 Review
π Enhance Your Aquatic Habitat with Pisces Midnight Pearl Aquarium Gravel!
9 Review
5.7lb Black Small Decorative Pebbles - Versatile Gravel River Rock for Succulent Gardens, Home Decor, and Vase Fillers
8 Review
𧲠Efficient Magnetic Fish Tank Cleaner: KEDSUM Floating Clean Brush with Handle Design
34 Review
π U-BCOO Aquarium Gravel Cleaner Fish Tank: Manual Siphon for Efficient Filter Gravel Cleaning and Water Change in Tanks
22 Review
Vacuum cleaner TEQQO Aquastick 3 in 1 Power, grey/turquoise
26 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review