Red Barb Dying?

[Neleono]

Hey everyone,
My sister has some tiger red barbs/glow fish, but they are starting to slow down. They are laying at the bottom of the tank, behind the filer and in small divots in the gravel. They don't swim around and only one really comes up to eat regularly. I'm obviously quite worried about them and I'm wondering if anything I'm doing is affecting them. Any suggestions help lots! Tank stats below:

Ammonia : 0
Nitrate : 30 (Before water change)
Nitrite : 0
Hardness : 170
Chlorine : 0
Alkalinity : 120
pH : 7.1
Temp : 78
Tank environment : 10 gallon with 4 fake plants, a small live plant, 2 fish, airstone

 

[itiwhetu]

Photo of the tank please, a photo is like a thousand words.

 

[Colin_T]

Any chance of a picture and short video of the fish?
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Do a 75% water change and gravel clean the substrate every day for a week or until we work out what is going on. Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

 

[Neleono]

Sorry for such a delayed response, the fish seemed to get better all of a sudden the day after I made this post, I assume this was just like a short and weird occurrence. also, I did do a water change and that seemed to make them normal again.