I am curently using API test kits... but my cal level is off the chart? i (520+) i don't dose anything right now. This is in my 6gal nano which i do a1 gal water change every 3 days... jsut wondering if there are any other good calicum test kits i can use? everything in my tank is fully open and doing well so im not too worried but i would like a 2nd opnion.