hows my water

Just after some feedback on my params as some of my corals are not happy and im only 18 months in on my tank.
Using red sea pro tester kit . api for ph and nitrate and salifert for phos I get..
Salinity 23.4
Ph 8.2
Nitrate 4
Amonia 0
Calcium 430 - 450
Alk 8 (2.9)
Mag 1360 - 1400
Phos 0
Temp 27 (80)

I have 40gallon with 2 tangs. Firefish. Coral beaty and pair of clowns.
Mixed corals are c.canes..trumpet. .acan..zoos..duncans..gorgonian whip..finger leather..favia and type of war coral..hammer and torch.
Any changes needed?? Oh and lights are 2x t5 and 2x t8

 

Wez, if you've been on this forum for some time, you'll find that a 40 gallon is too small for tangs ....I wish it wasn't the case myself. Only a tomini tang can be kept in a smaller tank and Corailline clarified that one needs at least a 75 gallon to house that.

In terms of your parameters, I don't know what the 23.4 is in terms of salinity. All of the other values seem good to me.

 

How are you measuring your SG ppt? And what are you using to measure it?

What salt mix are you using?

I am at a loss as to why your dosing so much per the other thread.

 

Are all the corals suffering? or just certain ones?

 

Its 1.023.4 if u like im using tropic marin glass tester and it measures decimals inbetween.
Got the tangs as babies but I understand they will have to go soon

 

I'd get a refractometer with calibration fluid to confirm salinity since all of your other parameters look pretty good. Possible the leather is doing chemical warfare on the other corals.

 

The leather has been getting silver tips on its ends lately and not many little green polyps and loads of like spiders web over it??

 

Worst Affected is my acans. Also sea whip is receding and iv just lost a torch. Can u have too many corals??

 

You can't really have too many corals; however, you do need to research each species. Many require a lot of space around them as they spread long sweeper tentacles at night that sting other corals. Some also require an occasional feeding.

As for the webs, that would be from Vermatid Snails. They spread webs to trap food, but they can also irritate a coral to death. It's quite likely that they're causing the Leather to release toxins that are affecting the other corals.

 

Are you running carbon? If not, you may want to look into running quality carbon at least for a little while and see if it helps.