Seachem Prime

[hanny93]

little bottles do not have droppers in the lid
i just dose enough for a 25l bucket which for me is enough to cover the bottom of the lid.

 

[Prime Ordeal]

There appears to be a difference between the North American versions and the European versions. Here in the UK Prime comes in open-necked bottles, and no dropper is supplied, which means you have to buy a syringe to accurately dose for small tanks.

 

[FishFanatic04]

The 50 ml bottle has a flip top lid and theres a small hole, when you turn it upside down it can drop droplets right into your water.