Restocking clean up crew

[Hilltopreef90]

I need to restock my clean up crew and need advice on what and how many of each I should buy. Basically I need snails and a few crabs.
My tank is over two years old and for some reason I’m having a cyno break out. What are good for that sort of thing ?
I plan to get some nassarias snails and trochus, what else are good for an aquarium.
I have a 90 gallon aquarium and most of my snails have died off

 

[shakacuz]

reefcleaners.org

they have "crew" packages base don tank size, or if you'd like to get a custom suggestion, you can fill out their custom package questionnaire to get a pack based on your needs.

 

[TX_REEF]

trochus snails for sure! 1 per 5 gallons or so is good. Why did your cleanup crew die? any parameter issues? Is surface agitation sufficient for oxygenation?

 

[Hilltopreef90]

trochus snails for sure! 1 per 5 gallons or so is good. Why did your cleanup crew die? any parameter issues? Is surface agitation sufficient for oxygenation?

I don’t know what’s going on my tank is covered in cyno all the sudden and it’s an established tank (going on 3 years) I also don’t understand why I have no bristle worms, in every tank I’ve ever had there were bristle worms and in this one I’ve never had them.
I’m curious if it’s because I used old rocks that were bleached ‍
Not all my cuc died but enough to need to add more, most of my snails hang out at the top even though I have plenty of water movement