How Many Fish?

[finchfarm]

Well, after a conversation I had on another board, I'm seriously thinking about getting species specific after my other fish pass and doing just Silver Dollars. Right now I have two Silver Dollars and a Silver Dollar Red Hook and I was told that I probably should get some more. I was considering going species specific for a while, but now I've pretty much decided. So I have a few questions.

Right now I have:

2 Silver Dollars
1 Red Hook Silver Dollar
1 Lemon Tetra
1 Black Skirt Tetra
3 Zebra Danios
1 Sailfin Pleco
1 African Knife

So, question #1: With my current tank set-up, how many Silver Dollars can I have?

My tank is 75 gallons and is 1.5 feet wide, 1.5 feet tall and 3.5 feet long, thereabouts. If I went species specific and didn't have all the other fish, how many Silver Dollars could I put in there then?

And for my last question, and this is probably one of those stupid fish myths that refuses to die.....do you have to have a catfish in order for your tank to remain "balanced/clean"?

 

[rocknurworld2006]

i personally think 3.5 foot is to small for a shoal of silver dollars!

 

[Duck and Dive]

About right but I wouldent recommend silver dollars.

 

[Biulu]

I wouldn't put in more than 5, just a small shoal because of their final size. It wouldn't be a problem though to add other fish as your bioload will be very low.

 

[Esfa]

nope, you dont need a catfish to keep your tank clean. most make your tank dirtier.

 

[finchfarm]

I'll have to get a real ruler and measure the tank dimentions. The measurements given were just a guestimation.