Alternate overflow vs. bulkhead fitting?

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Cecil B.

Cecil B.

Plecostomus
MFK Member
Dec 16, 2011
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Ligonier, Indiana
I'm setting up a 75 gallon aquarium to hatch trout eggs and grow out the trout fry and fingerlings before they go into a larger deeper recirculating system. I will be flowing in some well water at 51.6 F. to keep the water cool and in addition to biofiltration remove excess nitrates in lieu of water changes and a chiller. (Recent research has show that trout are also sensitive to nitrates.)


Anyway will need an overflow. If a bulkhead fitting is not practical due to tempered glass what are my alternatives?
 
Cecil B. said:
I'm setting up a 75 gallon aquarium to hatch trout eggs and grow out the trout fry and fingerlings before they go into a larger deeper recirculating system. I will be flowing in some well water at 51.6 F. to keep the water cool and in addition to biofiltration remove excess nitrates in lieu of water changes and a chiller. (Recent research has show that trout are also sensitive to nitrates.)


Anyway will need an overflow. If a bulkhead fitting is not practical due to tempered glass what are my alternatives?
Click to expand...

I prefer CPR overflows to anything else if a tank cannot be drilled. They are reliable and move what they advertise flow wise. They do require an additional pump called an aqua-lifter. This are cheap and great as well. Some folks have great success with DIY overflows however I must have always been doing something wrong when building them. Not my thing.
 
Thank you. I've decided to skip an aquarium and go with a custom built tank with some food grade 1/2 inch plastic I have left over from a previous project. I initially forgot I had it!
 
Well I've changed my mind again and will go with a circular HDPE food grade tank from a local tank maker I usually get seconds from for making my recirculating tanks. I usual get 4 to 5 foot tanks from them and cut them down to the height I want. This one will be a bit smaller at 35 to 39 inches to keep the fish somewhat crowded to keep territorial behavior down and feeding competitive. Once they get to be fingerlings they will be transferred to a circular tank that I fill to 150 gallons. And of course come spring go outside to my flow through pond that is fed with 45 rpm of ground water to keep temps from top to bottom about 60 F. except for the top few inches that rises to 62 F. even during the hottest part of the summer.

Water will be shot in tangentially against the tank wall to creat a centripetal flow for self cleaning and the tank will have an external standpipe to remove settleable solids. I will also have a large aquarium filter mounted underneath which will remove settleable solids and also act as a biofilter. Was think along the lines of a Fluvial 306 or larger?
 
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