Was looking at buying Go Fish (firewire) for 1-3ft fun days, I am intermediate surfer wanted some feedback on sizing.
I am 181cm tall 78kg, leaning towards the 5'05" 29.3l.
Haven't had this style of board before so a little unsure?????

Im 82kg, just under 6' tall surfed for over 40 years and my choice would be the 6'1, you'll be able to paddle in early and fast, have a higher wave count and being only 6'1 it will still be responsive,I think you'll struggle with anything under 30 ltr, my least volume board is 33 ltr 6'2 and i only surf it in summer when I'm not wearing a wettie. little extra volume won't hurt and will get you more waves

Really depends on your ability. I'm closer to 90kg ok surfer and would probably go the 5'11.
if your a reasonable surfer the 6'1 is a lot of board to try and manoeuvre on small waves.

generally these fish small wave boards are flatter with volume up front and paddle easier on to waves.

that said if your a beginner get more volume, but that's not the board for you in that case.