UPDATE - I finally transferred my shrimp from the vase to the tank. The vase had been in service for 7 years with no water changes - just topping off the water as needed. Trying to capture the shrimp with a net while still full of water was impossible. So I used a measuring cup and started taking water out and putting it in a separate bowl. I also took out all of the decorations and shells. When there was a few inches of water left, I used a small cup to capture several shrimp at one time and then scooped them out of the cup with a tablespoon (thanks to the person on the this forum that suggested that

) and put them into the new tank. I also used my shrimp net at this point, but ultimately decided it was easier to use the cup/tablespoon method because the shrimp did not want to swim out of the net. I think I killed one shrimp when trying to scoop him out of the cup using the tablespoon because it looked like his “end” was missing when I put him in the tank, yet he swam away.
When it looked like all the shrimp were out of the vase, I started to remove the substrate by tablespoon to find any hidden shrimp or snails. I was not expecting the mess that occurred at that time by disturbing the substrate (blue gravel) - green cloudy water. As I removed the substrate I found a few snail shells, they did not appear to be alive. I also scraped out a green thick film that was coating the bottom of the vase and covered with gravel - was not expecting that and it was pretty gross - not sure what it was. Also, a lot of the blue gravel had lost its color and turned pink which made it difficult to see if any shrimps were left behind. Ultimately, I think I transferred them all .... or at least I hope so.

It sure did not feel like I transferred 30 shrimp. Not sure I would want to do this again and half way through I was thinking I should just keep two tanks.
My original tank never really had green algae, but had brown algae on the decorations and shells. However, when I was removing the decor, I noticed that some of the shells and rocks had what looked like black mold on them. I was going to add a few of the shells to the new tank but decided not too- not knowing if the black mold looking stuff was healthy.
So, now its a wait and see if the shrimps will thrive in the new tank and breed. The new tank has the macro algae I bought earlier this summer. However, I am thinking that I have too much crap/decorations in the new tank and should remove some so the shrimps have more room ....
Thanks for reading.