Hello again all,
I wanted to provide another update on our friend Casper. We're getting along well...for the most part.
I've been doing some work on his tank which he has not been happy about, but I like to think he'll thank me. I made the mistake of doing the bulk of the work this past Sunday, which is his day to fast, so he was especially cranky with me that I was all around his tank and didn't once drop food in. He's normally pretty chill when I do water changes and just hangs out in his net (I still can't believe he does that), but whenever I put my hands in the tank to move stuff around this weekend, he was actively trying to attack me.
"You put your hand in here again, you're pulling back a stump"
As far as the work I've been doing on his tank...
In all my other tanks, I use a lot of live plants to help filter the water and suck out excess nutrients. With Casper and his tendency to eat pretty much anything that goes into his tank, it's not really an option. So, I had an idea to build a kind of sump system where I could house nitrate-sucking plants in a separate tank so they could filter the water without getting ripped apart.
So, let's see how this works...
Of all the "iums" in this hobby to keep track of, I think this most closely resembles a refugium, which is apparently fairly common in the saltwater world, but mostly used for culturing worms and such in freshwater and avoid them getting eaten right away.
I've broken down my 20 gallon quarantine/grow out and and put it next to Casper's 125. For the overflow, I watched a lot of YouTube videos on an overflow system and the one I ended up building out of PVC isn't exactly like any of them, but it probably most closely resembles the one from
Blake's Aquatics. I didn't want to limit the flow too much, so I used 1 1/4" PVC and 5/8" ID vinyl tubing across the top. I ended up putting a 90 degree elbow on the inlet to keep the water level up a little higher and above the bottom of the frame.
I had originally had the idea of using a spare powerhead to move water out of the small tank and into the big one, bu that didn't really work, since that's really not what they're designed to do, so I end up getting a (what turned out to be very small)
submersible pump from Amazon. It's much smaller than I thought it would be, but so far seems to be doing the job. It's connected with 3/8" ID vinyl tubing that runs to the opposite side of the big tank, up into an old canister filter outlet tube. The pump is only about 95 GPH, so it's definitely not blasting water out of there, but it's enough.
I've tried to set it up so that if either the pump fails or my overflow loses the siphon, things won't get flooded. Unless Casper somehow hulks the elbow off of the overflow (unlikely), there shouldn't be enough water to flood the 20 gallon and I've placed the pump pretty much as high as I can in the 20 gallon, so that if the overflow loses siphon, it would only pump an additional gallon or two into the big tank, which shouldn't be enough to make it over the lip. I guess that's the advantage to such a small pump. I am a little worried about the lack of water movement in the 20 gallon, since the flow is so low though, so maybe I'll add a spare sponge filter or air stone or the original power head in there just to get some water movement.
For nitrate, sucking plants, it seemed like hornwort and Amazon frog bit were some of the better options and I was thankfully able to find some locally (Shout out to World of Wet Pets in Beaverton--I just wish they were closer to me). I figured I'd start out small considering how quickly they are both said to propagate. I've covered the top with that plastic light diffuser grid from Home Depot (how versatile is that stuff in fishkeeping, btw???) and then put some pothos clippings from a friend of mine through that so the roots are in the water. Someone also recommended that I try sprouting a sweet potato in the water as well, so I plan to give that a shot.
I've mounted a Fluval Plant Nano above the pothos and I have a spare 18" Current USA LED that I can either put on top of the grid or slip down between the two tanks if the frog bit goes crazy to make sure the hornwort gets some light. Both are on timers for about 8 hours a day.
It's too soon to tell how good of a job this setup will do at removing nitrates, but it seems promising so far. Casper seems cool with it so far. It's far enough away from his pit that he doesn't get too grumpy about it. I've been pretty impressed with how well the overflow works, though. For an initial test, I set it up in my 75 gallon grow out tank that's across from this one. I threaded a garden hose onto the outlet and used it as an overflow to do probably about a 40-50% water change. It was able to handle the flow that comes out of my faucet, so I'm confident it will handle the tiny pump that's in there now. It was a little nerve-wracking watching my baby platies "investigate" the open overflow, but as far as I could tell, nobody actually got sucked out. So if this experiment fails miserably for some reason, at least I've built a pretty nifty way to handle a simple water change on larger tanks...