Ive been using the Twinstar Nano on a new tank and heres my feedback :
1] It does go a long way in preventing GSA on the Aquarium glass. I dont have any on this tank and I susually do have some in most of my tanks.
2] Doesnt help at all wit any non green algae
3] Doesnt do much as far as keeping hardscape clean goes. Just the rocks in a few inches radius are a tad cleaner than the rest
4] One great feature is that its been keeping my external filter pipes a LOT cleaner, so I can go longer between filter cleanings
5] It seems to keep the water 'fresher'. While my tanks dont smell at all, if I put my arms in to do some maintenance, etc they usually come out smelling 'planty' but with the Twinstar there is only a very slight smell
6] I cant really say whether it has had any positive impact on plant growth because I do know how to grow them. However it may just be a coincidence but this is the only time I have been successful at growing UG. Its spreading like a weed ! However, I can just as well attribute the growth to the new Planting Soil that I have formulated and trying out
7) Would I buy another one ? It does have some nice benefits but only if the price was dropped by 40-50% and if it comes in black