Do you have any livestock?
Your changing kH is interesting. Are you doing WCs and topping off with RO water or tap water?
Get a drop checker for a more accurate reading of your CO2 levels...especially since your kH is changing.
I do a 20% WC a week using tap water. It pearls real good right after the water change then when the lites go out for 2hrs and turn back on again in the afternoon. Pearling is very limited, The tank used to pearl all the time. I wonder if siesta period is no good? 8am to 12. 12 to 2pm siesta then 2pm to 8:30pm. 10.5 hr total Also I have 2sae's, 8neons, 8 assorted tetra's( small ones,rummynose,silvertip,phantom. 2 blue rams. 2 corys and 3 otto's. Do you think it's to many fish?
maybe you should try greg watsons ferts. even with the shipping to hawaii, all of the stuff will be cheaper in the long run than seachem stuff. easy enough to dose dry.
go to compleat kitchen in ala moana and get a set of those specialty measuring spoons (smidgen, pinch, dash), cost less than $3 (call ahead to see if they have in stock) if you do ei.
i also have a 30 gal, but with 72 watts cf. i can grow the basic stuff hygros, r. rotundifolia, and a little more demanding plants like l. aromatica, l. inclinata, l. ovalis. i've had a carpet of glosso cover the entire foreground. 192 watts may be too much if you've got staghorn. that also must generate a lot of heat. i have very little algae (mainly gsa) and the tank doesn't get too hot (no light fans).
I stagger the 2nd light right now to only get 8 hrs a day and the other one 10.5hrs. It does get real hot( the fixture does) however it doesn't seem to heat the water to much . The light is a coralife aqualight on the legs that raise it above the tank. The fixture has a fan also so I guess it helps. I was only going to use one bulb and run it straight [email protected]
I figured more light would be better but I'm still new at this. Saltwater live rock did better with bright light but I also had a chiller hooked up(to bad I gave it away with the rest of my saltwater stuff). What do you think I should do? Oh by the way, tell me more about the dry ferts.