Free Book Download: Coral Husbandry

Download each chapter on PDF at the link below.

http://www.burgerszoo.eu/over-burgers-zoo/coral-husbandry/table-of-contents

nice

I'll wait for the movie to come out. j/k Thanks for posting that I'll be reading it for a while.

Thanks Matt
I downloaded all the chapters and converted them to .mobi format and will add them to the Kindle reader, cool book.

I found this link...thanks Matt..not!

It's 2.30AM (I'm off tomorrow, fortunately) and I'm reading about water movement.

This is sad because?

A) It's 2.30AM and I'm reading this?

B) My Cichlids are looking out of the tank reading it too, and seem to be concerned about just what I may do to their tank? (My Peacock tanks right besides my computer)

C) I actually understand the formulae being discussed with Delta p and Delta m? And it makes sense!

D) The darkside has taken such a grip of me?

E) I need to step back a little, such as back to the "goldfish in a bowl stage"?

F) I had been concerned about the frictional loss of water flow for the one powerhead I have at one end of the tank, behind the rocks, due to the turbulence created by the rock itself.
And had been considering the possible need for one at the other end, at a different height, to create a contrasting movement. One which wouldn't just meet head to head, but create a circling motion, in addition to the flow from the back to the front, through the gaps in the rock.


mass (m) and velocity (v) which is: formula 1
p (momentum) = mv
m kg * s
Applied to a normal pump: the thrust that the pump produces is the water flow in L.s-1 or m3.h-1 multiplied with the velocity of the water at the pipe outlet into the tank (as water has a specific weight near 1 kg.L-1 the mass [ kg ] is simply substituted by the volume [ L ] ).
At first view this suggests to simply reduce the diameter of the pipe outlet to increase the velocity of the water. This is right to increase the thrust with existing pumps.
Thrust
As thrust is a product of water flow multiplied with the velocity of the water there are many ways to create thrust. A fixed amount of thrust may be reached either with a low water flow combined with a high velocity or with a high flow rate and a low associated water velocity. Figure 1 shows the relation at a constant thrust of 10 N. 
The water flow rate (V) is thrust (T) divided by the outlet velocity (v):
formula 3
V = T/ v
In this example always the same thrust is created but there are big differences in the required electrical power consumption and in the energy input into a certain amount of water. This last point is important if planktonic organisms shall survive in the water. The following formulas
By friction there is a permanent loss of the momentum inside the aquarium and this loss has to be compensated by a pump or any other device creating water flow. So it is necessary to permanently add momentum to the tank. And the input of momentum to the aquarium is: thrust (T)
formula 2
Dp Dm n T=Dt=Dt*
kg m s *s=N
N = Newton
Thrust is a common unit for the propulsion of ships (Menny, 2003) and aeroplanes and is in the meantime also used to calculate the mixing process in the biological treatment process (www1) in waste water plants. This application is very similar to creating currents in aquaria besides that there are no heavily structured reef imitations in the waste water basin. Thrust (T) has the same dimension as the force (F). The formula 2 shows that thrust is the amount of water per time multiplied with the associated velocity.

Hahaha. E) is my favorite... but if I have a goldfish bowl I'm lighting it with LEDs and those goldfish won't last long in 1.026 salinity. :-)