If he did do that he was putting those rays at risk for as long as he's been ray keeping. Rays are senstive to just about anything, and clorine water is one of them. For me as I live in a house where space is plenty, I'm able to treat my tap water in drums and use accordingly. However, there once was a time when I lived in an apartment and water changes were direct from the tap and I added the proper doses of prime into the tank first, then slowly added tap water. Everyone has their own system and if you decide to keep these rays you'll eventually create your own wc regime. My advice is to do what's easiest for you.
As for acclimating, I always do a slow drip. This will help the rays get use to the temp, ph and other water params in the main tank. Do this by placing an airhose to the main tank and siphon to a bucket. Drips will be fast and the quickest hack will be to knot the airline to the proper drip speed. I normally drip for 45 to and hour.
I forgot what I've read on your other post but did you mention your filtration system? If not, please do and we'll have heaps of people adding their great advice and suggestions. Install an app called whatsapp and I'll give you my number so we can communicate live if or when you need assistance. And it's free. Wait, maybe it's a dollar. I forget.
As for acclimating, I always do a slow drip. This will help the rays get use to the temp, ph and other water params in the main tank. Do this by placing an airhose to the main tank and siphon to a bucket. Drips will be fast and the quickest hack will be to knot the airline to the proper drip speed. I normally drip for 45 to and hour.
I forgot what I've read on your other post but did you mention your filtration system? If not, please do and we'll have heaps of people adding their great advice and suggestions. Install an app called whatsapp and I'll give you my number so we can communicate live if or when you need assistance. And it's free. Wait, maybe it's a dollar. I forget.

