So I have had the T5's off on my 210 sps tank . for a month now (trying to save some $$$$ ) the halides work great but I think the addition of the T5's really made a big difference . I can't be totally sure cause its only been a month . and the tank is going through its early stage changes . The bacteria is established . and the nutrients are falling like a stone I am thinking that has something to do with it as well . I might try and remove a bunch of cheato from the fuge , do some heavy feeding and see what happens with just the halides for another month . then continue that with the T5's . any thoughts on this out there ?