My water stats are GH 5.7 and PH 7.5 ... I've read they come from water that has some alkalinity so I'm guessing PH 7+ is ideal.
They are
quick and active and I'd feel bad for them if they were kept in a space anything under 3'
When I went into the shop to buy these, they looked nothing like they do now (in that vid I linked earlier). When they are stressed they go very pale. The problem with that, is that to the untrained eye, they all look female, and so trying to catch 50:50 of each sex is difficult.
It wasn't until they'd settled in did I realise that I had 13 x males. My understanding was that, as with most barbs, the idea is to keep a good mix of male/female in order to keep aggression under control and so I was concerned that I didn't have any females. 1 year on, that hasn't been an issue for me, but I put that down to having a good number of them. If I had 5 males for example, I think I would've lost at least one by now.
They can be incredibly skittish and shy. I had them on their own in a 4' for a while and whenever I'd enter the room, they'd dart off and hide in the plants. I was close to getting rid of them until I added a dozen giant danio. As soon as they were introduced, the Odessas came out and have never gone into hiding since. The danios are essentially acting as dithers. They coloured up beautifully as they are in that video and I'm always overwhelmed by how stunning they look.
In summary,
- I would say you need at least a 3 foot sized tank
- have at least a dozen of them and a 50:50 mix of sex if possible.
- keep them cool - their temperature range is 16c to 24c, so a mid range of 20c
- Barbs are tough, so yeh, ideal for a beginner.
Oh, don't keep them with corydoras! I learned the hard way lol.