looking for a test kit to buy .. ph is normal , but the tetra kit i bought is way too confusing , i need to buy a less confusing and easier to comprehend by a non chemist layman < Again any suggestions , are there strips i can buy and perhaps a chart ? i like API products at least the ph test kit is easy for me to understand and i am hoping the ammonia and nitrite is too , should i be testing for anything else i keep reading something about "carbonate" what is that and should i test for it also ? Also is it normal for water conditions to change ? two of the three ponds i have had almost a year and after the initial cycling i have had good luck with all the fish in them ( no deaths ... thank you God)... The third ( big koi in it ) is a new pond all cycling done and again No deaths , i have added gravel (rinsed and even added a little ammo- carb to it all rinsed in water conditioned water ) and it seems it happens each time i add gravel , i use the gravel to seat the lillies as the fish love to attack the roots