Why so hard and not useful

[Blue Ring Octopus]

https://www.bulkreefsupply.com/lugo...D=4518&indexName=brs_prod_m2_default_products
Why does these droppers always get so hard and are not useful anymore.
Does anybody have a link of the droppers they might use instead?
Thanks in advance

 

[FMF0331]

I hate them too, they get hard and crack.
I went to hobby lobby and got these.

 

[Blue Ring Octopus]

Great idea, I will do that.

 

[kevgib67]

https://www.bulkreefsupply.com/lugo...D=4518&indexName=brs_prod_m2_default_products
Why does these droppers always get so hard and are not useful anymore.
Does anybody have a link of the droppers they might use instead?
Thanks in advance

Same, I just bought another eye dropper when the one it came with wouldn’t work anymore.

 

[Randy Holmes-Farley Verified Community Expert]

The I2 in Lugols is reactive with many materials, including rubber. That’s a main reason I do not recommend it for dosing reef tanks.

 

[MajorDad74]

Buy them in bulk from Amazon or elsewhere. They’re cheap.

 

[Blue Ring Octopus]

The I2 in Lugols is reactive with many materials, including rubber. That’s a main reason I do not recommend it for dosing reef tanks.

So this begs the question what type should we use?

 

[Randy Holmes-Farley Verified Community Expert]

So this begs the question what type should we use?

Type of eyedropper or type of iodine?

For dosing, I recommend (and use) potassium iodide.

For the dropper for Lugols, the polyethylene ones that others posted should hold up well.