Hi Can some one please tell me for what reason do
python hoses get black algae in them
Thank you
The tubing grows algae and/or fungus for two reasons. One is the constant humidity inside it, which provides near ideal conditions.
The other is careless use of the hose - they need to be rinsed out & cleaned periodically & never left with standing water (especially tank water) inside them. If you do nothing else, make sure to drain all the water out, every time, before you put the hose away.
It helps to run clean
tap water through it to flush out any tank water if the last thing you did with it was suck out tank water.
The hose should be cleaned periodically if you can. A few times a year maybe.
Filling it up with bleach water & leaving it to soak is one way to do this. ( could use vinegar or H2O2 but bleach is cheaper.
Another way is to hook it up to a pump in a bucket or the bathtub or utility sink and circulate bleach water through it for a few hours.
Thoroughly rinse the bleach water out with clean water that’s heavily conditioned. .
Drain completely & hang up with as few loops as possible.
And, if this was a perfect world it would be best to ensure the interior of the hose dries out between uses, but this is hardly a perfect world

.
But a very determined type of person just might seal one end of the tube in a vacuum hose end if they have a vacuum that will blow air.
To lessen the pressure on the vacuum’s motor the hose should be laid out as straight as possible. I’ve no idea how long it might take to dry the interior.
Hardly worth the effort if you use the hose frequently but maybe it might be if it goes weeks between uses.