Angels With Clamped Rear Fins

[GouramiGirl87]

Much to my dismay i woke up this morning and looked at my angels and both of their tails are clamped up. I had high nitrates last week, did a 20% change, I just did another one this morning exactly a week later. High nitrates still right b4 I changed it. HELP!!! I'm taking the water in to one of the pet stores to get it double checked.
its a 20 gallon with 2 platys 2 small angels ( still babies) and a chinese algae eater, all other levels are fine.

 

[WILDER]

How many gallons is the tank.
How high is the nitrate.
When did you last squeeze one of your filter sponges.
Do you remove the ornaments for a gravel or sand vac.

 

[GouramiGirl87]

How many gallons is the tank.
How high is the nitrate.
When did you last squeeze one of your filter sponges.
Do you remove the ornaments for a gravel or sand vac.

its a 20 gallon tank. the nitrate is only around 30 now, I just changed my whole filter, on Nov 23rd.
Yes I removed the ornaments and cleaned the plants.
Now they won't eat. UGH!!

 

[WILDER]

Need to look at your other stats in ammonia and nitrite.
What your tap nitrate reading.

 

[GouramiGirl87]

Need to look at your other stats in ammonia and nitrite.
What your tap nitrate reading.

Everything else is fine, Nitrate is the only high one.
tap nitrate reading?