Black moor not eating and struggling to swim

[LordToad 1]

I have a black moor with another fancy goldfish in a 20gal. Recently, my black moor has not really been eating and has started to float around the tank in a ‘C’ shape. She’s been laying against my plants to rest.

i don’t have my water parameters as my test kit ran out but I know I have missed a water change. I am planning on doing a 80% water change but I’m unaware if she’d be able to handle such a drastic change in water quality. I’m currently running a sponge filter big enough for a 60gal.

[shakaho 6,312]

Do the water change.  Get a test kit.

[koko 14,335]

Please copy & paste the following form and fill it out to the best of your ability when requesting help for Goldfish Problems:

 

Test Results for the Following:

 Ammonia Level(Tank)

 Nitrite Level(Tank)

 Nitrate level(Tank)

 Ammonia Level(Tap)

 Nitrite Level(Tap)

 Nitrate level(Tap)

 Ph Level, Tank (If possible, KH, GH and chloramines)

 Ph Level, Tap (If possible, KH, GH and chloramines)

Other Required Info:

 Brand of test-kit used and whether strips or drops?

 Water temperature?

 Tank size (how many gals.) and how long has it been running?

 What is the name and "size of the filter"(s)?

 How often do you change the water and how much?

 How many days ago was the last water change and how much did you change?

 How many fish in the tank and their size?

 What kind of water additives or conditioners?

 What do you feed your fish and how often?

 Any new fish added to the tank?

 Any medications added to the tank?

 List entire medication/treatment history for fish and tank.Please include salt, Prazi, PP, etc and the approximate time and duration of treatment.

 Any unusual findings on the fish such as "grains of salt," bloody streaks, frayed fins or fungus?

 Any unusual behavior like staying at the bottom, not eating, etc.?

"If copy and paste doesn't work for you, quote this post and put your answers after each question."

[Arctic Mama 3,625]

You really need the test kit, I agree.  If you’re concerned about the water change then change, change out half and refill, then drain it again down to the last 20% and refill again. It can be a little less of a shock to the fish.  But honestly I wouldn’t worry too much about it at this point.  More critical is improving those parameters immediately.

 

Then off to the store for a test kit.

 

And then, please fill out the form Koko linked.  We can’t begin to offer more assistance without all that information, along with some clear pictures of the fish.