I think no one has mentioned these "issues" because they're not issues. You are the first person to complain that the Vortech pump is "noisy." It's not as quiet as the Tunze Stream because the motor isn't under water (that's a good thing) but I don't believe a reasonable person would describe it as "noisy." Perhaps your pumps need a few days to break in.
Yes it could take a few days to settle, however they are loud. There is no doubt about that. I could hardly hear the streams. Don’t get me wrong I don’t mind a bit of sound but get all three going and the sound is very noticeable.
I am using them on 1/2 inch glass tank which means the back of the impeller is closer to the glass. Maybe a problem.
The cable comment is just plain silly.
I don’t think it looks very nice to see nice reef tank and then see 3 white stickers on the side panel. Will get a photo up.
Last I looked the Tunze had an electrical cable attached to it and it was INSIDE the aquarium
Never an issue as you could only see 4 inches of it.
That "flow" you're observing on the surface is indicative of this wider flow pattern and is a GOOD thing.
Hardly a good thing if it is hitting my top brace. I want water flow over my corals not the surface.
MUCH wider flow pattern compared to the Tunze, which is a desirable trait and allows it to be effective in "smaller" and "shorter" reef aquariums
Maybe a additional attachment grill with a nozzle for large tanks would be good.
If you're simply looking for a pump that will reach end to end of your 9 foot and longer aquarium, then use traditional large powerheads or install a closed loop system.
I believe my 4 streams before all at one end worked perfectly.
Once you start to face them towards each other you get all the current in the middle. otherwise you can have one end on and the other off which would solve that however then you are only using 2 pumps a time in my case. also if you control pumps you lose about 30% of the flow as they will run at 100% then go down to 30%.
Why did i change to vortech? Because i liked the small footprint in the tank.
Still early days as i need more time with the vortech pumps .