moving fish?

Make the tank the first thing you move and the first thing you set up. Put the fish into a bucket of the water that they are in now and transport them. If you wanted to you could buy a battery operated aerator and put that into the bucket. If you wanted to save more water from your tank than what you're transporting them in (which would be a very good idea), put it into clean buckets and put lids on them so the water doesn't spill all over your car. Then you could just set up your tank in your new home and don't have to worry about conditioning the water or cycling the tank, it's already done.

Do not transport a full tank, it's heavy, dangerous, and can break your tank. Also, try to move the fish when it's cooler outside or you have the A/C in your vehicle running, you don't want them to cook if the water starts to heat up during the trip. Don't stop along the way, be sure you go straight from one house to the other so your fish won't have to be subjected to heat from stops. Be sure to put a little extra stress coat into the water since moving them will be pretty stressful for them.

Good luck!

If you have time before you move in your new place, this would be an ideal time to upgrade their living quarters. Buy them a larger tank, set it up and start a fishless cycle. Use the filter cartridge (kept in water from their tank so it doesn't dry out or have a sudden temp change) from their old filter to speed the process. They'll have more space and it won't be any more more difficult then moving the old tank, probably easier.

They can be transported by moving them and their water into a large bucket or other container as long as it is clean (without the use of soap or chemicals). 25 miles in a car shouldn't be to long for a couple of healthy goldfish. They'll be fine.

fish stores have bags for the fish, and a small cooler can be used to transport the water, most cooler have a quart size rating, just move them fast, last thing in the car for the trip and first thing set up at the new place

a cooler and big zip lock bags. the cooler will keep the temperature as even as possible which is a big concern winter and summer -- you don't want to freeze or boil them. fill up the zip lock with air like they do at the petshop and they are ready to go.

put them in a bag kind of like what you bought them in. If it is too small, an ice cream bucket with the lid on works good.

Read the answer I just gave to someone who asked the same question as you.