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I was in a pet shop a while back and when I looked at their bettas(kept in clear cups about the size of a med softdrink) I noticed that every one seems to have a light blue color to the water. Does this serve a purpose or is it just decoration?
It's an additive for the water that supposedly calms the fish and increases O2. They are never needed in a well maintained tank (or IMO shipping).
Slightly off-topic: Bettas need more than a bowl (at least 2.5G) that is filtered and heated. Any shop that tells you "they're fine in a bowl" or "they only grow as big as their enclosure" should be avoided.
It all adds up now, and yeah i don't listen to the sales ppl anymore, one sold my GF a Blood parrot and told her it would be good mixed in with a Betta and some sharks, we ended up with a dead betta and traumatized sharks so that was the end of taking their advice. The betta we have now pretty much has the run of a 10 gal tank so he should be good for space.
The other pet shop in town keeps all their Bettas prebagged(the bag is about the size of a small fist) floating on top of another tank with the bags knotted shut, makes me wonder how they get food/air. Long story short, we don't shop there anymore.
The bettas at your petstore are spoiled compared to the ones at our petco. They're kept in a plastic cup the size of a baseball and it has a little tiny hole in the top! They don't get fed unless you feed them yourself so I always bring my betta food and drop 1 flake and 1 pellet to each betta! I know that sounds like a small amount but the flakes are huge. However at our local petstore the female are kept together in a big heated filtered tank for normal fish and fed every other day so they can digest propely! The males are kept in 1 gallon plastic bowls people donate. And they don't keep more than they can take care of lime our petco!