clown knife fish

[vinimack720]

I have a 75 gal freshwater tank that is very lightly stocked, i have 3-1.5inch goldfish(going to find them a new home) and a 6inch dragon goby. I know a guy that is giving away his 6" clown knife fish and was wondering if i would be able to keep it. Would it eat my dragon? before you give me a yes or no let me tell you what other fish i was contemplating putting in the tank.

2-3 bala sharks
8 tiger barbs
1red tailed black shark
and maybe some other type of shark(not sure which, suggestions would be helpful)

would this combination work even without the clown knife fish? if so would adding the knife fish to the list throw everything off balance and end in a lot of dead fish?
the tank is not currently planted but i did ad some aponogeton bulbs(see my post in aquatic plants) and if they dont work out i will add some other type of plants to give my aquarium a jungle feel. im also going to add a large peice of bogwood to the tank to give the fish some more cover.

will all this work or am i being way to optimistic?

thanks for any helpyou can give me!

[Scuba Kid]

i wouldnt reccomend a clown knife.
1) they get HUGE. too huge for that tank
2)they will eat anything and everything that they can fit into their mouth. you will notice the tiger barbs dissapearing, probably the red tailed shark, and i wouldnt be surprised if it tried to eat everything else.

i would not take this fish if i were you. they are large predators and will not work out in the tank you want.

[Fishfirst]

exactly, and the violet gobie you've got is a brackish water fish, I would highly suggest adding some sea salt to the tank and turning it into a brackish tank.