RTC with gill curl need help!

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Crazyfish88

Feeder Fish
MFK Member
Nov 6, 2009
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BC, Canada
Ok I been doing alot of research on RTC with gill curl and I read it has to do with lack of tank space and bad water quality which confuses me because my water parameters are fine.

Anyhow at first it started with the left side and now both sides have it now. I do 40-50% wc twice a week, use prime to dechlorinate tap water and add aquarium salt each WC. I check my water parameters once a week using API test kits(test kits are barely 1 month old). My test results are almost perfect 0ppm ammonia/0ppm nitrite/20ppm nitrate/PH level is about 7.5(cities tap water has high ph to begin with). Water temperature is at 80-82 F. What gives with the gill curl? The RTC is about 10" and he's currently in a 225g tank filtered by a FX5/Rena Xp4/13watt Uv sterilizer). He's quite active and eats alot but I don't overfeed him. I feed him 2-3 times per week with Silversides and market shrimp. All the other tankmates are fine but the RTC. Can anyone else tell me why the gill curl is happening and getting worse?
 
Anyone? I already searched and read about RTC gill curls and been trying to heal it in the past 2 weeks and nothing works...Is it maybe lack of oxygen? I do have a air pump running along with a 1200gph power head on top of my cannister filters.
 
mine had it when i got him,seems to have gone down now but if i dnt do 50% water changes a week it starts to show up
 
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