Using shrimp to test a young tank

[Saltwater newby]

Hello
I was hoping to pick up to clown fish today from my LFS but since I couldn't bring a water sample I was told to buy 12 ghost shrimp to see if my tank can handle the bioload. Which I took her advice and purchased the $3.00 worth of shrimp. Has anyone heard of this method before? Does it make sense? I did previously buy 2 clowns from them before which only lasted 2 days in the tank before they died of brooklynella. Now my tank has been FISHLESS for over 2 weeks now. Before I had purchased them I would weekly bring them water samples up until they game the green light. And the Only thing in my tank now are 2 GSP frags I purchased last night.
I have 75g tank bubble magus curve7 skimmer 40pds of dry rock and live rock rubble in the 18g sump.

 

[gone fishin]

If the fish had brook in your DT then you will want to leave the DT fallow for I believe 8-10 weeks to make sure the brook has died off.

FWIW I have not heard of the ghost shrimp method.

 

[Saltwater newby]

Wow
8-10 weeks....
I assume it was brook
Definitely wasn't ich

Will it affect the GSP
OR is it true that it only attacks the clowns?

 

[gone fishin]

Only fish