Is my tank safe for shrimps

About 4 months ago I made a post about my amano shrimp not surviving more than 1-2 days at once making it home. At that time, redditors pointed to my use of an algaecide 4 months prior to introducing the shrimp that did them in. It's now been around 8-9 months since using an algaecide. Is my tank safe? Googling makes it seem like 48 hours is all I needed to wait, but reddditors on my previous post claimed my tank would never be safe.

About 4 months ago I made a post about my amano shrimp not surviving more than 1-2 days at once making it home. At that time, redditors pointed to my use of an algaecide 4 months prior to introducing the shrimp that did them in. It's now been around 8-9 months since using an algaecide. Is my tank safe? Googling makes it seem like 48 hours is all I needed to wait, but reddditors on my previous post claimed my tank would never be safe.