Yep. I believe everything depends on where you get your stock and how consistent your tank environment is more than anything else. Most everything you read is more of a guideline than an absolute fact. I've kept plenty of fish/shrimp in parameters that did not meet the criteria given as "suitable water parameters". I never test for gh, kh, tds, and I have never had any problems. But I am also consistent with my water changes and other maintenance.