I just finished reading through my entire build thread, and I was honestly surprised by how much my tank has evolved and all the problems I shared. Kind of like therapy for me. It made me realize how much I've learned along the way, so I figured I'd share a few observations.
As some of you know, I typically go 3–4 months between water changes. When I do one, I usually use an entire 200-gallon box. Interestingly, I used a full box of fritz red box last April and again this April, and both summers I experienced excellent coral growth. Otherwise I use instant or reefcrystal (which i dont love bc i feel its cheap for a reason). I'm wondering if there's a connection or if it's simply the warmer temperatures. My tank runs around 75–77°F during winter and 78–79°F during summer. I also suspect the trace element levels in Fritz Red Box play a role. One reason I can go so long between water changes is my DIY trace element dosing. Over the years, I've used ICP testing to fine-tune my dosing until I found what works for my system. For about a year now, I've been making my own iron and manganese supplements. Before that using Red Sea C which i loved but it didnt last long so created my own. I also dose Lugol's solution weekly
My weekly dosing:
- 20 drops Lugol's solution
- 40 mL homemade iron /manganese
My theory (Fact) is that many of the benefits we see from water changes come from replenishing depleted trace elements, particularly iron, iodine, and manganese. If we can consistently replace these through dosing, perhaps we can maintain many of those benefits without frequent water changes. I dont see a drop of or gain between waterchanges, something I used to back in the day and questioned that even at any early age. That tells me the tank is getting its dopamine hit with a waterchange mainly from depleted iron, iodine, etc. Sure if your relying on waterchanges to control nutrients that will also play a part. Cheaper than salt to replenish and reduces my carbon footprint slightly, which is important to me. For now, I prefer using large water changes as an occasional reset to replenish anything I may have missed along with a potential threat.
This approach has been working well for me, so I figured I'd share. Curious if anyone else has noticed a similar relationship between trace elements, water changes, and seasonal coral growth