Need a recomedation CA reactor or 2 part dosing?

[intarsiabox]

I have been 2 part dosing on my tank but it is only 20g. On a 90g tank such as yours a set of 32oz bottles of B-Ionic would only last about 40 days using the recommended starting dosage. Depending on demand this could easily become less than a month. My point is that it may be a lot more expensive dosing in the long run than using a reactor. I have no experience using reactors so this is only something for you to think about.