Just thought i should start a thread focusing on Ammania sulawesi, more commonly known as Rotala sunset. I haven't been able to find very much information about this plant (besides that it's "fussy"), so i'd like to share my experiences with it and hopefully some other people can chime in as well, since it can be a challenging plant to keep.
I'm keeping my 6 stems in a 90g tank right now. It has a 4x54 watt Catalina Aquarium T5HO (individual reflectors, about 5" above water surface), ADA Amazonia I substrate, pressurized co2 (always around 6.4 pH), and EI dosing schedule as follows:
- Sunday: Water Change. 3/8 Tsp CSM+B, 1/8 Tsp 13% Fe (EDTA)
- Monday: 3/8 Tsp KNO3, 3/8 Tsp KH2PO4, 1/4 Tsp K2SO4
- Tuesday: 3/8 Tsp CSM+B, 1/8 Tsp 13% Fe (EDTA)
- Wednesday: 3/8 Tsp KNO3, 3/8 Tsp KH2PO4, 1/4 Tsp K2SO4
- Thursday: 3/8 Tsp CSM+B, 1/8 Tsp 13% Fe (EDTA)
- Friday: 3/8 Tsp KNO3, 3/8 Tsp KH2PO4, 1/4 Tsp K2SO4
- Saturday: Rest Day
Believe it or not, i do not test my water, but i'll let you know what the GH/KH is at a later time. I just use plain ole' Phoenix tap water. Water temp is around 78F.
I've found that micronutrients play a huge role in this plant's appearance. When you don't give it enough iron, it's much paler. I recently added iron root tabs, and they are much more red than before. I've noticed that the growth is more compact, but i'm not sure if this is caused by the extra iron or not.
This plant needs plenty of co2 and a decent amount of light to survive. The only real problem that i've experienced with my rotala sunset is sometimes the leaves curl. I have yet to figure out what causes this, but the iron root tabs seem to keep the leaves nice and straight. I've also noticed that it doesn't recover from being trimmed too well (somewhat like a tonina). It's best to trim the top growth above a new side shoot. If there is no side shoot, the bottom rooted portion will struggle to recover when trimmed.
Here's a few pics. Sorry-- they're not the best quality, but hopefully they'll do.
Old stem grown without root tabs:
Grown with root tabs:
What it can supposedly look like (not my pic). I have yet to figure out how you can make it look this good: