That is the only caution for using JJ, kalk
, or anything else that alters PH
. If you use too much, depending on water volume you could have problems. JJ claims not to affect water chemistry, but I don't necessarily agree. I also had problems with it burning the fins of my fish, but I was also attempting to treat a large aiptasia problem. I would recommend it more for treating smaller amounts. I also now keep water ready and do small water changes to siphon the areas I treat to remove any residual particles. I would do this for kalk
too if using larger amounts.