I just got 2 ghost shrimps for my crowntail betta in my 1gal tank.
just now I saw the shrimp munching on his tail! I read they were
compatible. Should I do something? Also I want to know why
some bettas have curled up fins at the ends.. I see them like that
at a lot of pet stores and my crowntail's tail is recently starting
Feeling lucky today I see LOL (you asked 2 questions so you cheated a bit but we will let it slide - only for this once though ;) ).
OK, let's tackle question #1:
Why I don't recommend putting other creatures with your bettas:
|bettas are hard to match with
other critters because either the betta will pick on them (tried
snails once and the bettas ate them!) or the betta will be
picked on by them (as many people find out after adding a
seemingly innocent looking tropical fish to a betta's
||what works for one person might
not work for another. Each fish has its own personality, and
some are more aggressive than others of the same specie, same
goes I suppose, for shrimp.
||for me I do not see the
interest in adding other fish to my tanks because bettas are so
beautiful they do not need anything else to improve the visuals
of their set-up. I prefer to focus on the bettas and make sure
they have full complete undivided attention and priority.
||a betta that is being picked on
will promptly become stressed and this will lower its immune
system and it is likely to come down with a bunch of headaches
for you (fin rot, fungus, ich, bacterial outbreaks, etc...),
most of which are resident in your water and just waiting for an
opportunity to take over your fish. Remember that the only thing
stopping them from taking over is your fish's immune system. So
keeping that immune system happy and strong is a MUST.
||Bettas also have delicate, long
fins which are a great target for other critters. They will get
damaged easily and once damaged, rot can set in the wounded area
and will be hard to get rid of. Is it worth it? I mean, I like
shrimp, too, but usually with cocktail sauce LOL.
||if you want your bettas to be
happy, just get another betta in another jar and place it near
so they can see each other and interact. And this way no one
gets picked on.
In short my answer to question #1 is remove the shrimp and take them back to the store. (no, no do not eat the poor little thangs LOL)
Question #2 (and I'll keep it short)
Curling of the fins has been out there forever. It is not a desirable trait, but many fish, as the fins grow longer will get curled endings. We aim to breed it out of our strains and usually most of our bettas will not curl. But it is often seen still, especially with fish with heavy finnage. As for pet store bettas, they are not bred selectively and the hatcheries in the Far East do not care if fins curl or not, for as long as they get their 30 cent a betta and ship a zillion of them out to the US. And that's also why you pay $4 a betta (as opposed to say, $40). hence you might see a whole lot of curled fins in pet store bettas. Since you should never breed them anyways, it probably doesn't matter ;).
Hope above helped.