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Yes. this is a hydra. Yeah, this is an old thread. The website is probably out of business. Google "SL Aqua Z1 Planarian & Hydra Cleaner", or "planaria zero" or "no planaria" and just look for the most convenient site to purchase from.

My yellow golden shrimp turns blueish and I immediately have it in quarantine. What is wrong with it? I also found other shrimps have something white ish on their nose/front legs that are in the same tank. I think it’s infected the whole tank including my shrimplets. Can anyone help me identify this cause? There were 5-6 dead’s in the past few days, this morning I found 3 new tangerine tigers dead and 1 orange dead but don’t know when they were died. ?

I’m not quite sure, I saw ones that move quite fast and it can change its shape to be like tube look like (see below photos) while the one in the previous photo/post is very slow moving and I think I can see its mouth like those of snails. I just pick them out when I see any strange creatures in my tank besides my shrimps and nerite snails.

I tried my best to take photos of it and this is what I got for like 30 mins of trials. The photo didn’t show the color but it is green, not white like you said. I found some reading said that the green color is due to symbiotic with another of its kind forgot the name of that. So it is hydra, isn’t it? And yes it’s very hard to spot them since they are relatively small at this moment. I took photos with my iphone 13 pro max and trust me I’m suck at taking photos on phones! ? by the way, I tried the link to buy the product but the link is broken, is there any way I can get it from the US? thank you!!