Quote:
Originally Posted by kare-bear  Hi. Looks nice. What is that thing with the red circle stuck to your glass on the right hand side? |
It's a hydrometer that sticks on the inside of the tank. I keep it in there so I can better monitor salinity for a couple of days after water changes. I really like it!
Here is a link:
Aquarium Testing: Red Sea Hydrometer with Liquid Crystal Thermometer