I've been looking into adding a GFO/carbon reactor to my 65 gallon. I'm not real happy with my algae issues as of late. My current filtration is limited to a filter sock(which doesn't get changed often enough) and my skimmer. I am looking at the BRS two stage reactor, it seems to have a pretty solid reputation of being a good filter. I guess my question is, is this a needed part of a system , is it just a bandaid, or should I be focusing my time/money towards other things(better lighting). Also what substrates does everyone use, or does it really matter. If I go with the reactor I may loose the filter socks. Mine may get changed every 7-10 days. Some places are saying replace every 3 days. My socks aren't the easiest to get to for changes so I get lazy with them.