I've been using Crystalpro Carbon Boost for about two months now, and my aquarium plants have never looked better. The difference is night and day - my previously struggling java ferns now have vibrant green leaves, and my dwarf hairgrass is spreading like crazy.
The bottle's dropper nozzle makes dosing super easy. I add about 15 drops (1ml) to my 30-gallon tank after weekly water changes. Pro tip: I keep the bottle in a cool, dark place to maintain its effectiveness - the instructions mention this but it's easy to overlook.
What surprised me most was the algae control benefit. My tank used to get that annoying green film on the glass, but since using Carbon Boost, I only need to clean the glass about half as often. The plants seem to be outcompeting the algae for nutrients.
One thing to watch out for - don't get overexcited and overdose. I learned this the hard way when I tried doubling the dose 'just to see.' Ended up with some black beard algae that took weeks to clear up. Stick to the recommended amounts!
The bottle may look small, but it lasts forever since you use so little each time. Mine's still going strong after two months with about a quarter left. For anyone who wants healthier plants without dealing with CO2 injection systems, this stuff is magic in a bottle.