Both tanks do have plant substrates I use fluval bio stratum and both tanks are very new (about a week for the one with the small fish and 2-3 for the betta) but they were cycled with old media and dosed with quick start. All the water was dechlorinated and any heavy metals were removed. Today I did a water change (probably close to 15%) with a small cleaning of the gravel I also have shrimp but they had to be removed because of medications. All of the ammonia, nitrate, and nitrite levels were super low, basically 0’s across the board, but my pH was a bit lower than I would have liked as well (probably low 7 maybe even high 6’s) both a new filter with pretty good flow that I have at a water level where the water flows across the top for lots of surface agitation and they have activated charcoal in them. Because the tanks are so new I did not clean the filters. I just noticed that these fish had an off color today during cleaning and the small black ones I got 2 days ago and the betta got sick after I added guppies from the same store 2 days ago. They are from a local fish store that has been very trustworthy up to this point. I also had a half dose (one tablespoon per 10 gallons instead of 1 tbsp per 5 gallons) in both of those aquarium prior to seeing any illness to help prevent it. Tomorrow I will measure water parameters again and have more exact measurement rather than what I can remember from earlier and clearer imagery of the fish hopefully.