My Colombian shark catfish (Hexanematichthys seemanni) is very active, but it sometimes lays on the bottom of my aquarium, flat on its stomach. Is this normal?

haha will the salt kill the iridescent shark (Pangasius hypophthalmus)?

I have 2 Iridescent and 1 Columbian shark (both approx. 1.5 inches in length) in a 10 gallon tank. Yes I will be upgrading to a much larger tank shortly, but my question is how much aquarium salt should be added to make the water "brackish" and how often? Also, I do a 10 - 15% water change a couple ...

Thanks a lot everyone, you've been a great help.
It is probably too late to return the shark right now, I may be able to give it to a friend of mine. Ill stick to the columbian sharks once I get the nitrite levels back to normal.

-Brian

I am fairly sure that it is an Iridescent Shark (Pangasius hypophthalmus). It has a bluish silver tint to its skin and has a horizontal black stripe along its body. I have not tested the nitrite levels, is there a kit I can buy to do this? How long should I do daily partial water changes for? And as ...

Well this one is very young i think, it has only been in the tank for a week and seems to be doing quite well. On the other hand, i had another columbian in the tank for approximately the same amount of time and it died this morning? It was young but larger than my current shark. I'm not sure why it ...

Hi all, I recently bought a columbian shark (Hexanematichthys seemanni ?) and I am not sure how often it should be fed. Could someone please answer this question for me? It eats TetraMin tropical flakes