Replacing bulbs for planted tank... When?
So I've heard that fluorescent bulbs for planted tanks need replacing every year even though they still light up. Has anyone ever tested to see if they still grow plants well beyond a year? Can you start to see problems in your plants when it's time to replace them? I hate to throw away perfectly good tubes if they aren't that bad yet. Just interested in what everybody else does or if anyone has experimented with it.