Old Elos 70 - how to raise water level and reduce water noise?

Zpmada

Member
Hello,

I picked up a used Elos 70 and just attached my return pump (Jebao DCP 6500). Not sure if I set this up correctly. Return pump is set to the lowest power because there is too much draining noise that gets worse if I increase power.

The display tank water level is 2.5 inches from the rim. Is there a way I can raise the water level to 1" and will this quiet the tank? How do I do this? Seems any water I add just ends up in the sump and the level stays at 2.5"from the rim. I'm not looking to modify anything, just get it the way the manufacturer intended. I thought I read somewhere the Elos 70 display water level should be 1" from the top for optimal overflow functionality and I am wondering if this is why I am hearing so much water noise coming from the drain. Should the drain hole be fully submerged?

On the sump end of the drain, the drain end is about 1cm under the water in the sump. in the sump, should it be above the water or below?

Also, what is the little tube on the return in the display end? It seems to leak water if I increase the return pump power and adds to the noise. If I try to screw it in, it just keeps turning and doesn't feel like it's doing anything.

There is a big red valve on the drain that I have set to fully open. Am I suppose to close that slowly until the level reaches a point I would like? Seems like a bad idea - is it? Why are there valves on returns like this?
 

Attachments

  • 20250113_225758.jpg
    20250113_225758.jpg
    1.6 MB · Views: 11
  • 20250113_225818.jpg
    20250113_225818.jpg
    1.1 MB · Views: 10
  • 20250113_225825.jpg
    20250113_225825.jpg
    921.6 KB · Views: 10
  • 20250113_230148.jpg
    20250113_230148.jpg
    885.1 KB · Views: 9
  • 20250113_230946.jpg
    20250113_230946.jpg
    532.5 KB · Views: 9
Last edited:
I'm not familiar with Elos tanks but, based on this older thread it looks like you may be missing part of the overflow box. I wonder if that could be part of the issue? The fact that the water is lower than it should be is likely contributing to the noise. From a little research this morning, it appears that Elos tanks were designed to run pretty silently.
1736862031194.png


I *think*, the red valve would be used to regulate water flowing to the sump. If I'm understanding this setup correctly, closing the red valve partially, should (in theory) lower the water level in the sump and increase the water level in the main tank.

I'll take a wild guess that the little tube on the return is to prevent siphon in the event of a power outage so, it doesn't drain your tank down and overflow the sump.
 
Sorry! I'm not familiar with Elos either. I'd agree with Griss, and with you about how bad an idea it is to have a valve on the drain line. First suggestion is to see if you can find any of the manufacturers manuals on how it's supposed to be setup. Second is remove the valve on the drain line, or leave it wide open, use something like a PVC elbow or make something that will attach to the overflow to raise the water level then set the flow to a level that won't make too much noise, with wavemakers or power heads in your tank you'll have enough water flow for your corals and you can get away with just a few turnovers an hour through your sump.
 
I’ve never used or seen Elos in person but I think they got it covered above. I’m at work so can’t really look through the manuals to help answer.
 
I'm not sure about your comfort level for DIY but this is what I did. My tank is bigger but the corner box is the same. Lmk if you have any questions and I can walk you through it. FYI, due to the limitations of plumbing size you'll want to run lower than usual return flow. Otherwise I'm running a successful SPS dominated reef. Best of luck!

 
The small tube on the return nozzle is a siphon break so yes during normal operation there should be a small stream of water shooting out of it. It been awhile but I thought you could orient it to be below the water line. Regarding the gate valve, yes it's used to restrict the drain to maintain full siphon. I recall someone telling me these old Elos tanks were designed for SUPER low flow to operates near silent. It is scary because it doesnt have a back up drain thus my modifications.
 
Back
Top