Have you been doing water changes since you started the tank? Do you want to let your tank fully cycle before you do any water changes and I wouldn’t change the water for about 8 to 12 weeks after starting the tank or until you see a spike in nitrates and or phosphate: you want to let your tank build up bacteria.. if you started doing water changes too early or kept messing with rock in the tank you could keep restarting your cycle over and over again. Let that tank do its thing For 2 months without touching it or adding to it so it fully cycles
