Is this filter ok for saltwater tanks?

Well it looks like it has he bio bags and everything. I don't see why not. Do you have a 2.5gal tank? I have a 30 and I have about 200 of filtration in it and 45 gal of heating in it. You Don't need all that but I't better to. If it's 2.5 the water would change to rapidly the temp would go up and down constantly and the PH would do the same. If you made a typo and it's 25 you can put fish in it. Sorry if this didn't help.