Complicated Question

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Hello reefers!

I have a semi complicated issue. I have a fluval evo 13 gallon tank, that has been set up for about a year and a half now. It all started great and I saw incredible results pretty quickly on coral growth and fish happiness. I had GHA so I made a dire mistake and used some vibrant and Phosgaurd to try and knock it back. This bottomed out my nutrients and took out the GHA but caused an incredibly intense dino bloom. 7 months later after dosing silicate, keeping nutrients up by overfeeding, dosing microbacter7, and some phytoplankton I seem to have turned the tides. I've restarted water changes about a month and a half ago, returned to my old lighting schedule for my AI prime, and while I have a brown dusting on the sand it doesn't seem to be exploding anymore and is even slowly retreating. That being said my nitrates have responded well to returning back to normal tank husbandry (ie they hover around 5-10) from water change to water change. But my phosphates continue to be relatively high (hovering around 0.5). My corals clearly are not the happiest; they are brown, small and not seeming to grow. I'm pretty sure that it's the phosphates. I'll list my other parameters after this paragraph. I want to lower my phosphates but am pretty hesitant as I'm not sure that I'm completely in the clear from dinos. As of now I only have filter floss and marinepure balls in the back sump. I contemplated adding back either phosgaurd or chemipure blue to the filtration chambers; but am a little gun shy that it could cause another dino outbreak. Any thoughts on which direction I should take? I also have an auto feeder with nano pellets that feeds once per day, probably about 10ish pellets, that I'm probably going to remove and do some frozen food feeding in it's place. I use the red sea blue bucket for salt, and make my own RODI water, 20% water change every week.

Sg - 1.025
pH - 8.0
Amm - 0
Nitrite - 0
Nitrate - 10
Phosphate - 0.5
kH - 7.8
Cal - 400
Mg - 1280

Stocking
Ocellaris clown pair
Wheeler Goby
Cleaner shrimp
3 hermits
ceriths
nassarius

Corals
Assorted Zoas
1 acan (probably the only happy and growing coral)
2 ricordea mushrooms
2 branching hammers

Thanks for any help/input!
 
Had the same issue twice before I figured out that Vibrant kills off nutrients leading to dino's/cyano etc... Sounds like you just need to stay the course, could use some NOPOX, or VERY small amount of GFO, although I'm not sure how you'd incorporate it into your system w/no sump.
 
Avoid NOPOX - I crashed my system with it and it will take out both nitrates and phosphates. I used Phosphate E to control phosphates which tend to hang a bit high (.2-.3). My corals aren’t mad about the phosphates but I don’t have a lot of SPS
 
Lanthinum chloride. Go slow. Start with 1/3 the dose. Test regularly. Preferably with Hanna ulr

I have no concrete lab style evidence, but I do believe phosphate can bind up somewhere in out tanks. Be it the rock or sand or who knows. I remember dosing lanthinum chloride relentlessly and getting zero reaction from my phosphate levels. I upgraded tanks and ditched the old sand. I'm now running a fuge and levels are staying where I want them.
 
Lanthinum chloride. Go slow. Start with 1/3 the dose. Test regularly. Preferably with Hanna ulr

I have no concrete lab style evidence, but I do believe phosphate can bind up somewhere in out tanks. Be it the rock or sand or who knows. I remember dosing lanthinum chloride relentlessly and getting zero reaction from my phosphate levels. I upgraded tanks and ditched the old sand. I'm now running a fuge and levels are staying where I want them.
I hadn’t looked into lanthinum chloride but it sounds like it could be the way to go.

If I had my way I would definitely upgrade to a bigger tank with a fuge. Buuuut I think my significant other would not be the happiest, and I’m potentially moving in the next 8 months so it wouldn’t make the most sense. But there may be a fuge in the future after the move. Haha
 
With 20% weekly water changes and your low feeding, I'd guess the phosphates are leaching out of rock/substrate.

Just continue your weekly water changes and monitor your PO4.

You may want to consider a little carbon dosing. Maybe something gentle like TM Reef Actif.
 

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