floralicious bloom is good for phosphate which is good for flowering and has sea kelp, as far as my res goes its only 2 gallons, im a picky person and like to give my plants the freshest nutes possible, i change the res every week or every friday. i notice they like the fresh water and nutes a lot more than topping it off with your solution or the recommended 2 weeks and topping off with PH'ed water, they say you should top off with PH'ed water the amount of the res, for me it would be top off with ph water until ive used the 2 gallons. i just top off with PH unitl the week is up then i change it which is always just 1 gallon for me.