Thank you for all the responses, I'm not sure to be totally honest, I think they did, I have 5 other larger cory's and they are fine.Did they come without barbels? I've heard opposing sides on how substrate can damage barbels. So it may or may not be that.
Hey B,Hello cai...
Any substrate, decoration, rocks, etc. that's the least bit abrasive can potentially damage the Corys' barbels. Eco-complete doesn't have uniform pieces and some appear rough. I've never used it.
I've always used standard, "pea-sized" aquarium gravel in my Cory tanks. The gravel is polished, with no rough areas.
If your Corys' barbels are stunted or missing, then a change in substrate might be needed. The barbels can regrow, though. It typically takes two to three months.
I have a bunch of different loaches on Eco-complete for years and their barbels are fine.
I would have to agree with MSG's post about bacteria/DOC's being the possible reason.
What if you're using a dosing system such as PPS-Pro which doesn't really require you due to water changes. At the end of the day the water is still purified. Given that the substrate would be FloramaxI have a rough substrate for mine.. I think it has more to do with frequent water changes.
Here's my tankI have had loaches on eco complete with no problems too.
I am a water change nut, so not sure there is a problem there, I do 20 gallon changes a week in a 75, fully planted tank with a fx5.
How would I know if there is some type of bacteria in the substrate? Keep in mind not sure if they had no barbels when I put them in there but I'm thinking they were fine, just was looking at them the other day and thought wow how come there face is so round, also keep in mind others in the tank have no problems.