Hi all, I've been having a lot of trouble with this new 10g tank of mine; in spite of 1)seeding the tank with filter/rocks from an established tank, 2)low nitrites/ammonia, 3)stable temperature, 4)shrimps surviving at least a week or two, fish keep dying. I've tried WCMs, long finned zebra...

I have a 10gl tank with a submerged filter in it. I want to put a hanging filter in the tank to replace the submerged filter (it sucks and the motor is noisy) I'm just wondering what the best way to seed the new one would be and how long to have both in the tank before i take the submerged one...