I use a lot less than recommended also. I actually hate replacing gfo because it appears the chaeto and coral growth slow down for a week.
Funny you say that because typically a few days after changing out the GFO is when I think my tank looks the worst. Lol.
Very nice Jonathan. Nice selection of corals. Top down shots are always something I'm a wee bit jealous of as my tank does not allow for that possibility (because I'm too lazy).
It's scientific proof that lower phosphates help the calcification process that enables growth. The key is to find that happy spot for your tank. Unfortunately, I can't use chaeto to gauge my tank as I don't have any. Usually after I change my media, I get new growth. That reminds me that it's been almost 10 weeks…