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Otos really do like it in a big group. I had 10 in my 4ft tank once, and they would swim together. The problem with Otos is that, they compete with shrimp for the same food, ie. the biofilm on the surfaces of the tank. If you are okay with that and prepared to feed them regularly when the biofilm runs out, then Otos are great companions to shrimp. Of course they will both eat the same foods, so feeding both together is not difficult. Lot's of blanched veges like zucchinis, peas, carrots.

Hope you have better luck with this lot.

I have ordered some bluebolt, black taiwan bee and black KK shrimp (5 of each) to see how this goes now, the parameters are perfect for Caridina shrimp and there have been wild type cherry shrimp living in that tank for about a year or more with no problems, so am going to give it another go! Decided to get a delivery done before winter sets in here, and also getting 20 bloody mary shrimp for the old tank so will try and fish out as many of the wild types over the next few days to make room for the new red shrimps? I am getting this lot from ebay so will be interesting to see how that goes as it has been years since I used that for any shrimp? I prefer red taiwan bee but will just see how these black ones go first, obviously red will be much more visible to the fish? I guess I can rule out poisoning or disease as a tank issue as there have been shrimp living in the tank for a long time now! It still doesn't look nice and green though with this different substrate, and the fish may be an issue - hopefully the shrimp that are sent will be big enough to reduce the risk of that, the listing states they will be 15mm? Simon

That sounds like a good plan, I might even get 5 ot 6 as they are quite small! Simon

Thanks I’ve no problem with waiting it’s part of the hobby really. I was actually looking at the Ottos on line and was thinking of getting some so to have you guys mention them makes me happy. However it says online that they are happier being in a group rather than just one or two so do you think that I could have say 3 or 4 in my 64ltr tank