Hi Chongyu,
1.Echinodorus are large plants save for tennelus, quadricostatus, angustifolia and a handful of rare hybrids. A 2 ft tank is rather small for echinodorus. IMHO there's two types, echinodorus that creep and don't creep.
2.2inch for tennelus, 4 inch for larger species.
3.They are rather not picky about substrate though they do better with a bit more calcium in it.
4.Who dares say direct sunlight is not enough light?
The problem is the position of the light. The plant will grow towards the light. so if the sunlight is coming at an angle from the back then your plant will appear to grow backwards. Sunlight is mostly algae issue.
5.Root monster, You'll see the plant attach lots of roots on it and seems to suck it dry. Works IMHO.
6.Sturisoma's are ok.
7.Not sure about all of them, at ph5.8-6 my horemani is doing well, but not my rubin.
8.You can till it's root system exceeds the size of the tub. It will stay somewhat smaller if it the tub is limiting.
9.You can keep them small by cutting it's roots.
You can if you dare to fail - Stan Chung
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