I'm currently using the red sea program for dosing my large system. A 625xxl and recently switched my SR80 to Fauna Marin ready2reef because 1) I don't have a dosing pump on that tank and 2) it's much more convenient than opening up 8 bottles and seems to do the job in that tank. It's cost effective for the amount I dose on that tank as well. It wouldn't be for a larger system. I'm looking at switching from the RS program to the AF program. I've read good stuff on it and it seems that it is way more cost effective than the RS program. Problem is I don't know if it's as concentrated as RS thus negating the lower price by using more product. I'm running a doser system on my 625. Can anybody give me some I put on this? For reference I'm dosing 20ml alk a day. currently.