Jellyfish thinks it's a space ship

Your kind already think you are better than us because you are beautiful. We all know it's all trick photography and expensive lighting. And now you think you are a space ship? I know that you bear a passing resemblance to a Vorlon ship. But you have crossed the threshold this time, Jellyfish. I shall now proceed to "shoot you down" with a detailed technical rebuttal.

• Body/Hull: Is your body made of Duranium alloy? No? Diamondium or Diamondillium may be? No? How about just steel? No Jellyfish, your body is made of stupid jelly. I can poke holes in you with a toothpick. How do you plan to withstand cosmic rays and particles travelling near the speed of light? By the way, have you no sense of shame Jellyfish? I can see your insides, you translucent freak.
• Propulsion: What's your propulsion system? Can you form warp fields or travel through hyperspace or use dimensional folding? No? May be old fashioned sub-light travel with fusion reactors or particle scoops? No? You move by sucking in water and pushing it out? What kind of a weak ass propulsion system is that for a space ship? There is no water in space Jellyfish, there isn't even air. You wouldn't suck in and push out in space Jellyfish, you would just suck.
• Navigation/Sensors: How will you know what's around you Jellyfish? Can you detect all the particles, gravity wells, EM spectra and a million other things that can kill you in a nanosecond in space travel? No? That's right, you can barely even detect light. And how about calculating your trajectory? What kind of super computers do you have? You don't even have a brain Jellyfish, you don't even know that one and one is two.
• Defenses: Do you have laser guns, field disruptors, nuclear weapons? What's that? Jellyfish sting can even kill humans? I doubt that a hostile alien ship or a meteor headed your way will notice your pathetic sting Jellyfish. You are almost transparent? OK, but there are other ways of detecting you apart from visible light.
• Communications:No, you cannot communicate over hyperspace, you cannot even generate or detect microwaves. Heck, you can't even communicate with me if I held you next to my ear Jellyfish, you cannot talk! So you can communicate by releasing chemicals or flashing your bio-luminescent lights. But as usual Jellyfish, that's completely useless in space. I can drown out your light signals using my flash light, you have no chance against the sun and the stars
• Coolness Factor: OK. Fair is fair. This I'll give to you Jellyfish, some of you are bio luminescent and look cool, given the right conditions.
  

So you see Jellyfish, you are no space ship. You would positively stink as a space ship. So forget about space travel, come down to earth and have some plankton.