hi im picking up my red tail catfish tommorow he is a wild sent from Sri Lanka so the supplier has kept him in qarintine after his big trip to the uk.hes now ready for me to pick up iv got an established aqarium all set up for him ph 8.2 so i done a 80% water change and iv got my ph down to about 7.4ppm.my water out the tap is 7.2ppm i still think i can get it lower than that as my other tank sevrum tank sits at about 6.8ppm with no bog wood just slate and plants.will he be ok in with a ph of 7.4ppm till my ph settles over time.