Crab Flooded my Floor

preef

New member
The only sound worse to wake up to than a pump running dry is the sound of a water alarm blaring from behind your tank.

I quickly noticed that my refugium was overflowing and cut off the water supply into it. My refugium is in a 10 gal tank that is connected to another 10 gal tank I use as my sump with 2" PVC. I used two 10 gal tanks because there was no way to get a larger tank under the stand.

Here's are some old picture from when I first installed the refugium. Note the PVC pipe leading to the sump. Also note the elbow pipe inside the tank extending almost to the surface.
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I pulled off the elbow and I found it filled with live rock rubble I put in the fuge and one guilty looking crab.

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I caught this crab two years ago and threw him in the fuge. I guess he got back at me for putting him into solitary. Not only did he fill the elbow with rubble but a good portion of the pipe leading to the sump was filled. This was good sized rubble too. Most of the pieces were bigger than the crab.

So how the heck did he get into and out of the pipe in the first place? How the heck was he able to haul rocks that were larger than him up the side of the pipe?

I purposely did not install a screen on the pipe opening because I was afraid it would clogged with algae and cause a flood. I didn't count on an industrious crab.

The alarm wasn't going off when my wife left 15 minutes earlier so I thankfully caught it early. I would have never noticed it without the Water Warning Leak Detector alarm.

Not much harm was done this time. If it had happened an hour later I would have had a much bigger problem on my hands. Time to order a Waterbug and hook it up to my Apex.
 
Nice... Why did the flood happen? with no water pumping back into the tank (assuming thats what happened) would not it stop when the level went down to the drain? I am curious as to the mechanics of the flood because I am trying to make my setup as flood proof as possible..

Yes he looks guilty...
 
Nice... Why did the flood happen? with no water pumping back into the tank (assuming thats what happened) would not it stop when the level went down to the drain? I am curious as to the mechanics of the flood because I am trying to make my setup as flood proof as possible..

Yes he looks guilty...

The drain from my overflow gets split between my fuge and sump. Its controlled with a valve so I can keep the flow through the fuge low. The output of the fuge then flows to the sump through the PVC pipe the crab clogged. Since the flow was reduced the fuge eventually overflowed. This will happen well before the sump runs low and stops pumping. This will also be compounded by the fact that my ATO will try to keep the sump level to account for water being lost from my system.

The frustrating thing is he did it once more before I took any action. I figured it took him years to get all of the rocks in there. He was able to clog it again in a couple more weeks. I still don't understand how a crab that size was able to move rocks bigger than he is.

look in to putting a pvc shower drain in there - I did for mine - no more clogs!

I'm using a bulkhead strainer now. http://www.bulkreefsupply.com/store/products/pumps-and-plumbing/plumbing-sumps-drill-bits-overflows-uniseals/bulkhead-tank-adapters/bulkhead-strainers.html
Ironically I had it all along but didn't use it because I was afraid it would get clogged and cause an overflow.

I also replaced the battery powered water alarm with a waterbug so I can stop my pump and send an email and text message when a flood is detected. I also have my controller turn on a really loud alarm. In addition to this I added a float switch in the fuge, DT and sump to detect high and low water levels to turn off the return pump before disaster strikes.
 
lol...yeah i think you have your bases covered now, with the alarms, float switches and txt msgs. I would be surprised if you ever have a flood like that again. one word of caution though check the float switches about every month or so for salt creep build up. if it gets on there too bad, the float will be stuck in the down position and water will be above it (happened to me).
 
That little bass turd needs to be taught a lesson.....dangle it in front of a trigger/puffer tank and threaten to toss him in if he acts up again.
 
lol...yeah i think you have your bases covered now, with the alarms, float switches and txt msgs. I would be surprised if you ever have a flood like that again. one word of caution though check the float switches about every month or so for salt creep build up. if it gets on there too bad, the float will be stuck in the down position and water will be above it (happened to me).

Yeah, I'll have to do a monthly clean and test. I was thinking cordlike could cause them to fail too.
 
That little bass turd needs to be taught a lesson.....dangle it in front of a trigger/puffer tank and threaten to toss him in if he acts up again.

The funny thing is that after I put the screen on I took the 90 degree piece of PVC and placed it on the sand bed of the fuge. I expected the crab to build his nest in there. Of course he hasn't touched it.
 
Yes, I believe that is a capital offence...


I forgot about the RO ATO... I have been concened about that. I spotted this auto RO shut off leak detector and I think I will be getting one...

http://www.bulkreefsupply.com/store...ak-controller-detector-for-ro-di-systems.html


I was planning on getting a Reefkeeper Lite (Net) system, but I think I will have the ATO just a simple as possible and keep it independant from the RK system. Dual float valve for redundancy and a solenoid on the RO...

I guess that is also a does point out one issue with a piped independent fuge... Thanks for the info.
 
He probably has a little front-end loader stashed in there somewhere. You need to get him a little hardhat.
 
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