HI, CHEFFY_CIA, WELCOME TO FISHLORE!
You have a planted tank? Are you using any CO2?
Do you have any driftwood? What is in your tank besides the fish and plants?
First thing I would suggest is to STOP using ph up...stop the chemicals....
Second thing I would suggest is to get the carbon out of your filter. Most of us here don't use carbon unless you have just used medication, after the full course of meds. put carbon in your filter for 24 hours then discard it.
What is your water change schedule? It sounds like something in your system is bringing your ph down, if your tap water is 7.
The suggestion to use coral is good. If you don't want to change your substrate, you can use sea shells or a chunk of coral for decorations. I do both in my cherry red shrimp tank to bring ph up....
I can't help but notice your tank is overstocked....the fish may not be fully grown yet, but the adult size of the fish you have listed indicate you will be experiencing more problems if you don't split the fish up with another tank. Good Luck, and enjoy the forum....we love new folks to jump right in. Pictures are great also!
