Help on zoa's not opening

[darkreef]

Thinking on renting a hare for a bit. And I put the power head right on the zoo's see if that maybe be the problem . If it still keeps up I'm going to move them down to the sand bed . Going to buy a new tooth brush and brush the algae off . If my lion will let me that is don't want to get stung . See all my other zoos are doing wonderful. One of my sps died though . Not sure if I bleached him or if he's dead .