03-10-2013, 09:42 PM
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I've had a Cory cat in the past that literally had it's eyes bulging out. I just thought this was a side effect of ammonia poisoning and/or other parameters out of whack. None of the others contracted it but unfortunately the Cory didn't make it. It was a pepper cory, which makes me wonder if different species of Cory cats resist diseases and medications differently. Seeing the fish like that prompted me to do a 50 - 75% water change. However I didn't scrub anything , added NO SALT, dosed with stress Zyme & Water conditioner (or equivalent) to the amount needed for the entire volume of water in the tank and added Microbe-lift Nite-Out II as well. This quickly brought the Bad water condition back into check and possibly removed the bacterial or viral (Not sure) culture in the water. I assume this effort is what brought the other Ill looking fish back to full health. IMHO, medicating has only caused me problems and disrupted the system so much that I would now only use it if absolutely necessary (As in the entire tank is about to crash). Otherwise a decent 50 - 75 % wc should do the trick. Just make sure your temp is nice and regulated during the transition... Sick fish are even more susceptible to abrupt changes
As far as the gravel goes... Pea gravel is OK for Cory's but it's not Ideal. As long as there aren't any sharp edges on the gravel it should be OK. I personally asked the same question and ultimately decided to switch to sand and love it. It's easy to plant in, safe for the Cory's and my Bolivian Ram and looks great with the theme my tank is centered around. Play Sand is very cheap and readily available...