um i'll answer these questions as best as i can...
i only have 1 loach cos it was given to me by a friend and that's all i have at the moment... didn't buy anymore cos my silver dollar is getting a little aggressive so i'm just leaving them at the moment cos all the fish have worked out their pecking order.
the silver dollar is probably about 10-12 cm big (about 4/5 fully grown)
the loach would be around 8 - 10 cm big
and the sharks...
2 of them would be close to 12 or so cm in length (had them for a while now)
and there are 3 smaller one approx 8 or 9 cm
not sure on what the plant is... sorry
I am pretty sure if u've only got 1 bala shark that they tend not to live long enough to get HEAPS big (i saw one in a shop a little while ago that would've been close to 15-16 cm).
They are a schooling fish so if you have two or three the tend to eat much more.
i'm still coaxing my lancer out of its little cave for long enough to catch a clear photo
here is a very blurry pic of it's head..... SORRY!