Curing/Cycling, Diatoms, and Water Changes

shadesatsetbreak

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Brand new to this gig, let me outline everything: I received two boxes of live rock on Feb 7th, so we are going into our third week of curing at the time of this post. When I first received the rock, I had someone visiting so I quickly threw it all in a tub and let it do its thing for a couple days, with a 100% water change on the 9th, and another 100% change on the 11th.
Pulled all the rocks out and gave them a solid scrub on the 14th, I think. And obviously all new water.
Since then, my ammonia has been off the charts except for right after water changes. I'm using the Hanna LR Checker so that only equates to >3.6ppm, but I've reason to believe it's considerably higher than that. The corals and feather dusters that are on the live rock are doing totally fine, so I try not to worry about it.
I've not really been keeping track of nitrites because I also stupidly got the Hanna checker for that, and it only comes with a few sachets of reactant and it's ridiculous how much they cost to refill so I've just been ignoring it.
My water changes started at 100 percent every two or three days to now about 50 percent every three days.
My nitrates today read .12ppm.
So my rock still seems to be curing, or at least there's die off in the tank because my ammonia is still sky-high even with frequent water changes.
Lights are running about 7hrs/day.
I've been feeding reef roids for the corals every two days- they really needed it and have responded well to feedings...any tissue that was lost during transit is growing back rapidly.
Diatoms just started showing up. I know this is normal, but there's a decent bit of sediment and (detritus?) on the bottom of the tank. I wanted to remove the rocks, give them a good scrub like I did on the 14th, to remove any dead tissue in hopes it slows down the ammonia spikes.
However, now that I have diatoms and readable nitrate levels, I'm worried that removing the rock and scrubbing it will stall the cycle.

So my question: do I remove the rocks and scrub everything real good and put everyone in new water, or do I just keep letting everybody do their thing and perform 50% water changes to keep ammonia in check until the die off stops? I expected the diatom bloom to happen after all my ammonia was gone or at least when it had stopped producing.
 
Some pics for your entertainment:
Sediment (detritus? It's slowly been building up since I scrubbed rocks the first time):
IMG_20200227_192350.jpg

Diatoms!:
IMG_20200227_192422.jpg

Corals don't look great, especially that Manicina, but they are bouncing back quickly with regular feeding reef roids:
IMG_20200227_192430.jpg
 
So now I'm totally vexed. I did a large water change (~60%) and checked ammonia immediately after. It came back >3.5ppm still. I seriously doubted that it could be so high even after a large water change so I decided to check my saltwater I had just mixed: >3.5ppm there. Ok so I checked my rodi water and of course it was zero, just as it should be.
So now what? I assume it's one of three things: my salt has ammonia in it, my mixing tub is leeching ammonia (is that even possible? It was used to cure my live rock for about a week but I washed it thoroughly afterwards), or the Hanna reagents are bad and only show it when there are salts in the water.
I'm hoping to test ammonia with a titration kit tomorrow to check, but does anyone have any experiences with something like this?
 
hey, just reading through threads about cycling cause im very new to all this and i see no one has responded yet so i wanted to ask a couple questions...

i am also cycling my new tank with live rock but my understanding is that ammonia is supposed to be high in the beginning .. thats the first part of the cycle... from my understanding when you do large water change (too early) you might be slowing the progression of the cycle?

from what ive read, water change should only be done after you see the whole cycle of ammonia peak > nitrite peak > nitrate peak ... so your nitrate test kind of determines when to do the water change?? do you have nitrate tests ( i think the salifert line is recommended for newbies)

i dont know how big your tank is, cant remember if you said? ... i have a 20g with live rock and sand and i was only recommended to do a 10% water change after seeing the cycle reach completion... but i know there is a lot of conflicting info and variety of ways to successfully cycle.

hope you get the answers and support you are looking for
 
Got my answers. I was a dummy and failed to notice the Hanna checker is for freshwater only. Ammonia readings were fine. Finishing off the algae end of the cycle, which bloomed a bit more than expected because my phosphates were high. Got that under control, GHA is now dying off and I'm adding corals and livestock.
Having trouble with Astraea snails dying really quickly. Ordering from reef cleaners maybe they're just not shipping very well.
 

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