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Hi Michael. When you set the A421 you have a few options, in your case you should set it to turn off when a low temp is reached 8c. This is called the 'Low Temperature Stop' (LtS). It should turn off the deep freezer as soon as 8c is achieved. What I don't know is how a deep freezer functions. Will it continue to cool even after the compressor is shut off? Can it be set to operate above 0c? I do know the A421 will work very well at shutting it off at the correct temp. Here are instructions to help you set the LtS: cgproducts.johnsoncontrols.com/met_pdf/2476643043.pdf?x=69&x=69

mogtrader8 yes you can remove the end cap that rotated and put on a flat piece that doesn’t vector the water. Hope that helps

Hi WaterGrunt! The Tunze light works very well below the water, because the light doesn't have to shine through the surface. I feel it actually is brighter and more spread out, it kinda reflects off the acrylic surfaces and seems to make the water "glow", unlike a conventional light that produces a lot of shimmer and reflection on the ceiling. I like the look and so does the refugium.

42 Wallaby Way, Sydney*

Hi David... Simple answer is it works very well. I have found the LiterMeterIII to be very reliable and super accurate. I too worried about the water exchange triggering the auto-topoff to kick on. But I remove about half a gallon (0.5gal) of water a day, divided into 150 cycles each removing about half an ounce (0.5oz) each cycle and then after that adding half an oz back, repeated 150 times a day. This 0.5 oz of water is about one (1) cubic inch in volume which is in a sump area of about 100 square inches so the actual sump water level drops by only about 1/100 of an inch and then when the water is added it raises the 1/100 of an inch. This is far too small of a water level change to trigger the auto-topoff to turn on, so the systems can and do work independently. So no problem with running both water exchange and auto-topoff simultaneously on my setup. Hope that helps!

@@psherman4714 where did you get those labels for your mixing drums?

cichlid guru nyc hi... yes I think this overflow would work actually better on a larger aquarium, mine is very small only 60 liters or 15 gal so I have the flow really choked down. Honestly the loudest part is the return pump, but sines it is a cabinet in the sump the loudest thing I hear is the cooling fan on the light.

P Sherman .thanks buddy .I'm mostly freshwater guy but I'm trying to setup 75 gallon tank in my room .

Not much to update it has been running flawlessly since the video was posted. It seems like once a day it goes into reverse mode for 60 sec to clean out any sand in the intake and that makes a little water noise due to the turbulence we call the Crazy Ivan. I haven’t hooked up a backup battery yet. I am reorganizing the sump and will post a video once I’m done. Thanks for checking it out!

P Sherman. Really want to see how your tank is doing. I love all the attention to detail you had

Full detail over and detail of how your tank is doing hahaha

A421 Johnson Digital Controller, no part/model number Here is a link to the one I bought: a.co/hwktsHo

Hi theklrdude oo .... the overflow tube would work if you were just trying to add water and skim off the same amount via the tube. But we also need to account for evaporation using an auto-top off. The trick is running both an auto-top off and a water exchange simultaneously. The water level drop due to evaporation is the trigger for the auto-top off. But you don’t want the water exchange to trigger the auto-top off. So you may be able to use an overflow tube, I will investigate this and see what solution may be possible. Thanks for the idea

personaly i breed discus and i dump every day about 20% new water in my system . which is a bit cooler than my tanks . this water has to travel through all my tanks and return to the sump before it reaches the waste tube . because it is a bit cooler it stays on the bottom and it takes a while before it goes though the skimmer , by then the water change is completed . it is safe and fool proof (something i need:) ) the water is pumped by a sump pump on a timer that sits in my storage tank. i never do a thing to it !

Hi there Matthew Mallard... The fittings I used are from Bulk Reef Supply: • 1/2" MALE NPT X 1/2" PUSH CONNECT (SKU 10003) (quantity 3) • 1/2" X 1/2" ELBOW UNION PUSH CONNECT (SKU 100001) (quantity 2) • 1/2" WHITE MUR-LOK POLYETHYLENE RO TUBING (SKU 10004) (quantity 3 ft) • 1/2" X 1/2" ELBOW UNION PUSH CONNECT (SKU 10013) (quantity: 1) I used an ½” NPT x ½” RODI at the PVC connection from the return pump then ½” RODI tubing to a ½” Elbow Push Connect that is pushed into the ½” NPT x ½” RODI that is threaded into the lid of the AVAST. Then for the water leaving the AVAST it is another ½” NPT x ½” RODI with a ½” Elbow Push Connect pushed in to make the 90 def turn to some ½” RODI tubing to a ½” x ½” Push Connect Elbow over the sump and some more tubing down into the return water chamber. The only issue is when the sump vibrates for 60sec twice a day it does transmit some of that vibration to the RODI tubing which makes a little more noise. You could use silicone tubing as a way to isolate the AVAST but I don’t find the transferred vibration to be an issue and I like the ease of use and reliability of Mur-Lok RODI fitting so I am keeping this set up. Hope that helps!

P Sherman they do t have them anymore in the 1/2 threaded grrrr

R&J REEFS yes the Gate valve works great, because my aquarium is so small it is an absolute must because I can set the flow rate so precisely

Thanks! I have been using mine for about a month and it is working well so far... Good luck on your system.

Hey thanks! I really like using the Zeovit system and the reactor makes it super easy.

Yeah it is running but at the lowest power setting. I usually have it in pulse mode to run from 20% on the low end to 35% on the peak. Unfortunately you can't go any slower than 20% because the pump needs to keep spinning to keep from stopping and having to restart, the one drawback to a levitating pump. As far as noise I worry your results may vary but I think my pump is silent, at 2 feet I can't hear it at all. Good luck!

Thanks!