if b-ionic has been working for you, then there is no great reason for you to switch to brs 2 part. the amount you save won't make you rich. I think you need twice the amount of brs 2 part (1 ml/gal) compared to b-ionic (0.5ml/gal) on average (of course ymmv according to your tank consumption, but you will be looking at double the amount from what you were dosing with b-ionic). given that 1 gallon b-ionic will cost about $40, and 2 gallons brs will cost $30+ (with shipping) plus cost of trace element if you dose that, the difference is not going to be that much. I have used both and there are pros and cons for each, but either one will work fine.