Acropora STN

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Hi all,

One of my acropora had been looking a little off last few days and noticed some STN on the underside of the arms, steadily getting worse I decided to try and frag it to save it, upon removing it today it looks pretty much beyond the point of no return. Water parameters all in check but noticed some small visitors on the base when I removed it - could not ID as they were so small (grain of sand kind of size) would not spot if they weren’t moving (looked brown/reddish) - pretty new to acropora and cant see elsewhere although a goniopora has also retracted any idea what this could be ? I had a stylo next to the acro that seems fine but worried now that they will eat there way through all my corals.

Asco1104

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Reply #1

Hi the bugs could be acropora eating red/black bugs.
They could also just be pods.
To me it looks like the flesh is peeling of? Or are there bit marks?

When you say your readings are stable, what are they and how are you keeping on top of alk, cal and mag?


Tim

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Matt_toynton

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Reply #2

 Can’t see bite marks Tim, it does look like flesh is literally peeling off ! So far I haven’t had to dose anything outside of water changes once every 4 days, fairly new with SPS so please go easy on me if I’m doing something stupid or need to dose ?


Readings are ;
Temp 24.5 -25 c
Salinity: 1.025
PH: 8.1
Nh3: 0
No2: 0
No3: 0
Po4: seems higher than usual 0.64 (is this too high)
Alk: 11.5
Cal: 400
Mag: 1200

Asco1104

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Reply #3

Hi

0.6 is very high and probably the cause, you want it at about 0.03 for sps.

Water changes are good for soft corals but when you start to get stony corals your parameters can swing a bit between water changes, alk and salinity are the main ones to watch with sps but all the others are important too.

A good way to test is do your water change then test just before the next one and you will see what your usage is. If it’s over 4 days take the difference between the 2 tests and divide it by the days, so let’s say four and that gives you your daily alk usage.

If it’s more than .5 of a dkh sps really won’t like it and strip.

Your magnesium is a little low but not to bad, calcium is fine.


Tim

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Matt_toynton

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Reply #4

Tim, thank you that’s really helpful advice !


Do you find that there are better products than others for quality and also for dose instruction ? Usually find Red Sea stuff good but must say the NoPox really isn’t doing much for phosphate levels, going to pick up some continuum phoscorrex tomorrow and try that. Do you also continually run something such as Rowa to maintain po4

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Reply #5

I had a calcium reactor for the first year and I’ve only been dosing for a few weeks now, I’m pretty lazy about mixing stuff so I went for triton.

There are loads out ther and bioaquatek do all the salts you need to diy it yourself.

I tried to not use gfo but my bio load is too high for my algae bed to deal with on its own so I have put Rowa phosphate back in now.


Tim

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Matt_toynton

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Reply #6

 Cheers Tim

Ok so the Continuum phoscorrex has lowered the Phos down to 0.12 things looking better on the LPS side of things I’ve gradually dosed over a few days rather than dump the suggested dose straight away. Unfortunately the Acro did not make it .. however Alk is stable at 10 so should be perfect imo ? Must have been the sky high phosphates causing the damage.. I really don’t know where the phos is coming from - only feeding tiny amounts of frozen brine shrimp that’s getting eaten, thawed in a net so not using the thawed water I don’t make my own RO and don’t TDS test my LFS water could it be that ? Struggling to lower phos beyond .012 so I’m assuming what I’m treating is just being topped back up by something I’m doing wrong ?

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Reply #7

Moving in the right direction, it could be the lfs water, do you get it pre mixed, if so test it for phosphate. If you get plain ro mix to to 1.026 then test for phosphate. You can’t test plain ro.


Tim

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Matt_toynton

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Reply #8

No Tim I mix myself using RSCP. I’ll test again tonight and see if it’s dropped anymore since dosing this morning as they don’t get fed tonight

Gav

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Reply #9

I'd also test your fresh salt mix for Po4 , I had a bucket of RS salt where each fresh batch measured 0.07 ppm for Po4 !!
Nopox as well as any other carbon source only uses small amounts of Po4 compared with No3 . You will run out of No3 before Po4 . Once this happens Po4 will not drop any further as the bacteria fed by the Nopox require both elements to work .
I don't think I've read any accounts of Nopox being able to completely deal with Po4 on its own and most end up running Po4 media along side their Nopox dosing .

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Matt_toynton

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Reply #10

Cheers Gav

Yep struggling to lower any further than 0.08 using a red Sea Pro test kit - currently treating with Continuum Phos-Correx. No3 at 2ppm  - LPS looking better on 0.08 but really wanted some acros for some colour but after the last couple stripping i dare not introduce unless i can get the p04 down to around 0.03

Crushed Coral sand bed now starting to go brown now during the day, and not in shaded areas so thinking ive now got a diatom bloom - N03 seems OK maybe substate and rock still leeching Phos .. keep vacing substrate but just keeps comming back, tank well established ( over a yr,  and well out of cycle )

ajm83

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Reply #11

Cheers Gav

Yep struggling to lower any further than 0.08 using a red Sea Pro test kit - currently treating with Continuum Phos-Correx. No3 at 2ppm  - LPS looking better on 0.08 but really wanted some acros for some colour but after the last couple stripping i dare not introduce unless i can get the p04 down to around 0.03

Crushed Coral sand bed now starting to go brown now during the day, and not in shaded areas so thinking ive now got a diatom bloom - N03 seems OK maybe substate and rock still leeching Phos .. keep vacing substrate but just keeps comming back, tank well established ( over a yr,  and well out of cycle )

Going in the right direction and tbh mate 0.08 is not too much of a disaster, glennf runs his between 0.04 and 0.08 for example

https://reefbase.co.uk/members'-tanks-6/glennf's-dsr-tank/525/

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Matt_toynton

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Reply #12

Cheers Andy


It sure why as all parameters are fine, no overly turbulent flow but now my euphillas are looking long and stringy ? Had the hammer for a good 6 months with no major growth at all but used to have thicker tentacles as did the cornet - they will thicken up a little when lighting schedule reaches its highest point but don’t look like they should see pics for ref



Matt_toynton

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Reply #13

I’ll send another pic in full light later on

Gav

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Reply #14

It does look as though it has started to strip around the edges a little

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