• For a Limited Time the R2R Partner Membership is NOW OPEN! Get some cool swag and chances to win part of over $20,000 in prizes! Click here for more details

Water tension

https://www.triton.de/en/

Shawn_epicurious

Valuable Member
View Badges
Joined
Mar 1, 2020
Messages
1,651
Reaction score
2,872
I have a question I have been curious about for awhile now. 200 gallon tank, 40 more gallons in the sump.

Every day right after I feed, my two return lines start blowing bubbles... not bad, aerates the tank a bit, stops after 30 minutes or so. I’ve watched my skimmer. It’s not “really” picking up more water... a little maybe. My return pump has the lowest average water level in my sump. From what I can see, a little whirlpool develops above the intake ports on that pump.

But why does it do it only when I feed? Is something changing the water tension?
 

Larry L

Valuable Member
View Badges
Joined
Nov 4, 2014
Messages
1,318
Reaction score
1,295
Location
Denver, Colorado, USA
What are you feeding? If it's something fatty/oily it's possible the food is creating a slick on the water surface that increases the surface tension just enough for the pump to create a vortex. Or, to cause your skimmer to pick up just enough extra water to lower the level in the return section by a fraction.
 
OP
Shawn_epicurious

Shawn_epicurious

Valuable Member
View Badges
Joined
Mar 1, 2020
Messages
1,651
Reaction score
2,872
What are you feeding? If it's something fatty/oily it's possible the food is creating a slick on the water surface that increases the surface tension just enough for the pump to create a vortex. Or, to cause your skimmer to pick up just enough extra water to lower the level in the return section by a fraction.
I feed one square of the Formula 2 frozen mysis shrimp, a small squirt of refrigerated mysis shrimp (for my smaller fish and some good dry pellets. I also feed phytoplankton Once a week..ish... I’ll give my eel some dehydrated krill (rehydrated of course)
 

Randy Holmes-Farley

Reef Chemist
View Badges
Joined
Sep 5, 2014
Messages
39,644
Reaction score
27,761
Location
Arlington, Massachusetts, United States
What are you feeding? If it's something fatty/oily it's possible the food is creating a slick on the water surface that increases the surface tension just enough for the pump to create a vortex. Or, to cause your skimmer to pick up just enough extra water to lower the level in the return section by a fraction.
FWIW, surfactants would lower the surface tension, making it possible to form bubbles more easily.
 

Randy Holmes-Farley

Reef Chemist
View Badges
Joined
Sep 5, 2014
Messages
39,644
Reaction score
27,761
Location
Arlington, Massachusetts, United States
I have a question I have been curious about for awhile now. 200 gallon tank, 40 more gallons in the sump.

Every day right after I feed, my two return lines start blowing bubbles... not bad, aerates the tank a bit, stops after 30 minutes or so. I’ve watched my skimmer. It’s not “really” picking up more water... a little maybe. My return pump has the lowest average water level in my sump. From what I can see, a little whirlpool develops above the intake ports on that pump.

But why does it do it only when I feed? Is something changing the water tension?
Formula 2 contains a number of ingredients that are surfactants (like soaps) that lower the air/water surface tension and make it easier to cavitate and create bubbles. Lecethin, for example.
 
https://www.triton.de/en/

How concerned are you about high phosphates in your tank?

  • VERY Concerned

    Votes: 14 24.1%
  • Somewhat Concerned

    Votes: 33 56.9%
  • NOT Concerned At All

    Votes: 9 15.5%
  • Other (please explain in thread)

    Votes: 2 3.4%

Online statistics

Members online
2,151
Guests online
4,706
Total visitors
6,857
Reef Brite the professionals choice
Top