Clownfish acting odd after goby death

[brandonbrm]

So I noticed the past day or two my 13.5g saltwater tank start to get a bit of algae growth, I decided to do a water change today and found my goby dead beneath a rock, so I removed it as well as the contaminates, now my clownfish and damsel are breath fast, and my clownfish are laying on the sand, sort of floating now and then, but acting completely strange. I tried to feed them both before and after the cleaning and they didn’t budge. Completely unlike them!
Please help!

current water conditions:
Nitrate 0
Nitrite 0
Cl2 0
Alkalinity 80
Carbonate 40
Ph 7.8-8
No clue on the ammonia, I don’t have a tester, will be getting one in the morning

 

[Jay Hemdal]

Hi, welcome to Reef2Reef!

I know this is tough, but with one fish dead, and the other two showing severe symptoms, you may not be able to solve this issue in time to save them.

It is likely a gill disease like velvet, or a water quality issue (low oxygen or ammonia).
Do you have any invertebrates in the tank? If so, and if they are fine, you should focus on this being a fish disease, as a water quality problem usually affects both fish and invertebrates.

Here is a link to other information that is helpful for us to know:

Some Helpful Hints When Posting or Responding to Threads in the Fish Disease Treatment and Diagnosis Section

Aquarium Fish Disease Problem Solving Determining the best course of action for a problem with your aquarium can be a difficult task. Even advanced aquarists will often need to seek the help of others for complicated or unique issues. Our intent here on Reef 2 Reef is to offer expert advice...

www.reef2reef.com

Jay

 

[vetteguy53081]

With heavy algae, I too suspect low oxygen

With heavy algae, most light do not deliver the intensity to promote it.
By chance, is this tank at or near a window?
Are you using RODI water or tap water from the faucet?
What is your phosphate level ?