also how fast are the bacteria in the filter able to adjust to bio load?
planning to transfer 1 more ray this coming weekend, was thinking if i can get away with transferring 2 more at the same time instead.
Out of all species of freshwater fish the Stingray produces the most ammonia. I suggest adding one at a time and monitor your parameters. You will need to find out if your filter can handle the bioload and add additional bio media or filters. Also proper water changes will be a important factor.