Ok, a bit more information ?
I am keeping neos, orange pumpkin.
I'm setting up a a 9 gallon tank that I'm moving them to once its cycled and matured a bit. The new tank has stand and a lot more rock with mostly moss as plants. TDS is 150. I have not tested the Ph here since it can change once the cycle is complete. I'm just letting it run for a month adding ammonia and bottled bacteria.
The tank they are currently in has a GH of 8 and a KH of 4, PH of 7.6. I use tap water but I do have fluval stratum in the current tank. TDS is 181. I'm a bit concerned about Ph here since thats a buffering substrate and I still have a high(er) number.
I bought some GH/KH+ a while back but never used it. I didn't really understand the concept back then.