I am considering getting a betta, either for the existing fish tank, or I have a 15L which I could set up. Could someone please let me have preferred water parameters, ie GH, KH, PH, TDS ranges. I have been looking on the internet (other than this site)
There is probably some truth to this. Fish with heavy finnage like halfmoons or super deltas may experience more than a healthy amount of stress from too much water movement. So care should be taken when filter shopping to find one that produces a mild amount of water agitation when return...
Learn why betta fish don’t belong in small, one-gallon tanks. There are better options if you want your fish to be happy and healthy.