White Spots After 5-day Treatment

[veryfishy]

Hi,

I'm having a white spot problem. Here are my parameters.

Tank size: 60cm X 35 cm X 45cm
pH: 8.0
ammonia: 0.0
nitrite: 0.0
nitrate: 20
kH: 12
gH: 15
tank temp: 25

Fish Symptoms (include full description including lesion, color, location, fish behavior):
White spots

Volume and Frequency of water changes:
20 to 30 % every week

Chemical Additives or Media in your tank:
Nutrafin Plant Gro and water conditioner

Tank inhabitants:
2 X Honey Gouramis
4 X Cherry Barbs
3 X Botia Sidthmunki
4 X Cherry shrimps

Recent additions to your tank (living or decoration):
1 X Cherry Barbs
3 X Botia Sidthmunki

I noticed white spots on a cherry barb 3 weeks ago and bought eSHa Exit. It cleared the spots after 3 days.
Just over a week ago I added four more fish. After 3 days I noticed that the new barb had white spots so I did the treatment again. As he still had spots on the fourth day I carried on for two more days.

Now the four barbs have white spots. The botias and gouramis don't seem to be affected. Should I carry on the treatment and for how long?

Thanks.

 

[WILDER]

You are meant to carry on treating another week once spots have gone.

 

[veryfishy]

Thank you for your help.