Would highly recommend switching to a shrimp remineralizer. If you don't mind parameter swings, then get a remineralizer that is GH and KH. Eventually, the soil will stop buffering but it may take a while. You want to keep the GH up around 7.
I have 3 GH/KH out of tap. Plenty of people say they do fine in tap. Well, they died in mine. People said that once they have offspring, the offspring will adjust better than the adults. Yeah... they died faster than the adults did! I use remineralized RO water now-a-days.