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Yeah the lineage 1 Corydoras which have long snouts the males can get quite aggressive. They aren't that common in the hobby though. I imagine most regular LFS wouldn't even carry them. The Wet Spot gets them in but now that I know about this issue I won't have them again. I believe the lineage 8 ones which also sometimes have long snouts are not as aggressive. Scleromystax supposedly can be as well but I haven't seen it yet in my tank except when they are breeding he sometimes chases away other fish.
The sand in this tank is ADA La Plata. I also added some ADA La Plata gravel which was a mistake because it keeps getting infested with BBA so I have been siphoning it out every time I do a water change. Right to the left of the Corydoras you can see a chunk with BBA on it.
The rest of my tanks I am using Buce Plants Natural sand. Pretty good stuff. In my old tanks I was also using Caribsea sands and even though they are good for Corydoras because they are so fine I didn't like them because they are so powdery the sand sometimes sticks to the fish and I would always think that they had Ich.
The sand in this tank is ADA La Plata. I also added some ADA La Plata gravel which was a mistake because it keeps getting infested with BBA so I have been siphoning it out every time I do a water change. Right to the left of the Corydoras you can see a chunk with BBA on it.
The rest of my tanks I am using Buce Plants Natural sand. Pretty good stuff. In my old tanks I was also using Caribsea sands and even though they are good for Corydoras because they are so fine I didn't like them because they are so powdery the sand sometimes sticks to the fish and I would always think that they had Ich.