thinking of getting one

6 months or so, then you will need to go a lot larger.
Jason

6 months is a good guess depending on how small it is when you get it.
I would say a year at the max (assuming it is well fed and well taken care of)

just save for a bigger tank

dont buy it and a say you will get a bigger tank when then time comes.

you dont even need a grow out tank if the aro is bigger than 6in

just toss it in

get a bigger tank first... saves a lot of stress, and possible jump suicide time when you have to switch tanks.

DeLgAdO said:

you dont even need a grow out tank if the aro is bigger than 6in

just toss it in

Click to expand...

not always true.....I had a foot long silver that got munched.

drewgodat said:

how long will one last in a 75? a silver that is

Click to expand...

Not ideal conditions...Probably need 210.

rallysman said:

not always true.....I had a foot long silver that got munched.

Click to expand...

What munched it???

Go after something with a foot print of at least 72x36, but bigger the better.

Well... how long is your silver now? If it is around 6-7 inches, then i will probably last around 10 months. I say just use the 75 for now, then when it comes to time try to get the biggest aquarium you can to house the silver, something at least 6ft long X 2ft front to back.
By that time you can always use your 75 gal. to house other fishes or create a beautiful aquarium set up.
For me... it's always good to have an extra aquarium around!!