08-29-2013, 08:26 PM
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Fish rubbing on objects (flashing) is a symptom of many issues. I would not raise the temp unless you have diagnosed the problem as ICH. Raising the temperature could cause some issues to become worse like columnaris.
IMO your temperature is on the high end for Corys and I would suggest lowering it around 76 if possible. This may or may not help your issues as I am not sure what it is. I would suggest a long observation with the room lights off and the tank lights on; This way they cant see you and are less likely to be spooked. Look for anything that doesn't look correct.
Coppersafe/Maracyn is good broad spectrum combo that treats some of the most common issues. ICH, Columnaris, Flukes, Velvet, Fin rot, Tail rot, Parasites and Popeye to name a few but the coppersafe is harmful to inverts and likely some plants. I have used these with Anubis, java fern and Cryptocoryne without negative effect. Is it possible to move the inverts to another tank? Also. make sure that you sanitize everything (nets, buckets, siphons...) to prevent reintroducing the issue to your newly treated tank.