Here's some more info about the Iinknii's history.
History Beginning (cont.)
Post Grand Meetin, Pre Galactic Assembly
After the Grand Meeting the Iinknii underwent a large rebuilding time, starting most of their fleet from scratch. New ships were designed and put into production, a large population boom rocked the Iinknii race, and the fleet kept on growing. By the time the Iinknii met their first Galactic Assembly they were larger and stronger than they had ever been before.
First Galactic Assembly
Contact with the First Galactic Assembly was made on the year 7684. A huge array of species (much like our current assembly, although weaker and less advanced in technology. Keep in mind, this was a while ago) were present at the first meetings, but they didn't go too well. Most of the species called for the Iinknii to leave, not wanting a powerful race present in their galaxy, and several factions within the Iinknii called for the conquering of the species. They argued that the Iinknii should keep moving on, stripping the areas they found of anything useful. This only caused the already large rift between the Iinknii and the Galactic Assembly to widen.
On the first day of 7685 war was declared on the Iinknii by the Galactic Assembly. What ensued was disatrous for the aggressors. The Iinknii, skilled in fighting in outer space, quickly decimated the Galactic Assembliy's fleets, cutting off communications and trade between the many different races. Planetary systems fell, technology was harvested, and small contignents were taken of each race while the rest were left to live out the rest of their lives on useless planets.
By the end of the war, the Iinknii had lost what amounted to an E Fleet. But this was nothing seeing as the size of the fleet at the time before the war amounted to a collection of 10,000 E Fleets overall (an E Fleet consists of 5 carrier groups. A Carrier Group consists of one carrier, one battleship, two cruisers, four transports, and four destroyers. Sometimes a mothership or two is tacked on with these groups). What the Iinknii gained were the resources for another 10,00 E Fleets, although they didn't focus all their resources on the fleet. Many new technologies were acquired from the Galactic Assembly, the entire Iinknii race benefitting as a whole.
EDIT:
@ nuclear: That's pretty much it, they use the radio waves to bounce off things. They also have a system of using 'visible light' (by our standards) to transport, much the way we use radio waves to transport messages.
@ aligon: While they may look unbalanced, they have pretty strong back muscles, much like our arms or legs. They're used to moving around like that so balance doesn't really affect them.