currently im dosing 350ml of hydroxide and 375ml of calcium of the diy 2 part per day im wondering how much all for reef i would need (obviously the powder) just wondering caus the 70$ one would get me about 30 days and 70$ a month is quite a bit. would i need to dose less all for reef and would it be worth it. i dont do many water changes due to 300 gallon tank i usualy do around 15 gallons a week.