I asked this same question few days ago but I now have pics . My Cory has a white spot on both his sides directly across almost like it goes right through him and there are white spots on his pectoral fins where they touch the spots on his sides. I'm pretty sure it's not ich because it's no where else on his body and none of my other fish have it. I added a bit of salt to the tank the other day and turned heater up to 80° for the last 2 days I added melnafix . Nothing has changed. Parameters.. 30gal, temp, 80, some live plants, ph 7.2 , ammonia 0, nitrite 0, nitrate 20-30 ppm ( normal for my tank) tank is 4 years established, hob filter, 25% water changes weekly , filter cartridge approx every 3 weeks. My biggest problem is my hospital tank is not available, I was gone for a month to work and my daughter filled up the hospital tank so the filter would not run dry from evaporation, but she just added tap water, no fish in the tank at the time so she thought she was doing me a favor. But chlorine decimated my bio filter and I'm in a nitrite spike right now trying to get the bio back. Anyway here are the best pics I could get
Please help with Cory white spots( sure it's not ich)
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The pictures aren't all that in focus, however you ruling out ich, and with the tank for 4 years now I'd think you'd know ich or not, I'd say it's fatty nodule deposits on the fins, the fish is getting too much to eat. If you fast the fish and cut back on food it should disappear. If it's a bronze cory (Corydoras aeneus) they are more prone to these fatty growths than other types of cory, but they all could get it from eating too much.
If they are holding too much fat it can sometimes manifest as a white spot in the fins, dorsal or pectoral.
Easy enough to confirm buy cutting back feedings to see if it reabsorbs as the fish burns more calories than it consumes. and then going lower fat content in the foods fron there to stop it reoccurring.
If it's a fat deposit it's going to look, up close, more like it's "inside the fin" and not "on the fin" You can also check it with a metheleyne blue dip. If it's under the slime coat and not a break in the slime coat it won't stain blue. Ich is on the fish, this would be in the fish and more visible because it's on the clear fins.
If they are holding too much fat it can sometimes manifest as a white spot in the fins, dorsal or pectoral.
Easy enough to confirm buy cutting back feedings to see if it reabsorbs as the fish burns more calories than it consumes. and then going lower fat content in the foods fron there to stop it reoccurring.
If it's a fat deposit it's going to look, up close, more like it's "inside the fin" and not "on the fin" You can also check it with a metheleyne blue dip. If it's under the slime coat and not a break in the slime coat it won't stain blue. Ich is on the fish, this would be in the fish and more visible because it's on the clear fins.
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It's a Corydoras schultzei and probably has problems due to the substrate.
Are Cory's not good in the type of substrate I have, I'm sure you can tell it's just a bag of color pebbles from petsmart, and if it's not the best for Cory's what would you recommend? That will also be safe for my sailfin pleco , and rainbow shark, I assume basically anything is fine for my mid and top level fish, ( tetras, guppies ect...)
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Thank you I'm in the process of cycling a 30 and 5gal tanks , 5 is gonna be for hospital tank but neither tank has any sub yet so I went and got pool filter sand yesterday . I have a question that may seem elementary but in my many years of fish keeping I have only had tanks with gravel or no sub so I wonder how do I go about vacuuming sand to eliminate waste? I would think my gravel cleaner would just suck up all the sand
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Smaller gravel vac will work. Or it becomes a 2 hand process with your current one....one hand holding the gravel vac above the sand, the other to stir up the substrate to release the "gunk" in it.
I went with the smaller gravel vac as it will suck up the "gunk" and not get much of the substrate in the process. I'm using CaribSea cichlid base which I'd equate to coarse sand.
Good luck...my cories did not like the colored gravel at all. Lost several due to the sharp edges on the stuff. River pebble works fine though if you want something a bit more natural that isn't sand.
I went with the smaller gravel vac as it will suck up the "gunk" and not get much of the substrate in the process. I'm using CaribSea cichlid base which I'd equate to coarse sand.
Good luck...my cories did not like the colored gravel at all. Lost several due to the sharp edges on the stuff. River pebble works fine though if you want something a bit more natural that isn't sand.
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