Thought I’d post a quick update as it’s been a while.
While this little AIO tank is great on space, I haven’t ever felt like they are great at nutrient export. Despite changing my feeding to 3/4 cube every other day (for four fish) and dialing up my Tunze 9004 - I’ve always felt like there have been high nitrate/phosphate issues still at 1.5+ years in.
My workaround thus far has really been to do massive water changes around 80% every two weeks, but that’s not necessarily sustainable. So the next target was really clearing out the rear chambers, as I’ve had a suspicion they are detritus traps.
The major culprit was a DIY rubble basket I had in one of the chambers. I removed it, scrubbed and vacuumed out the chambers, which only confirmed my suspicion.
In speaking with the folks at InTank, they actually recommended trying to seal off the main rear chamber (circled below in red) as they become nutrient traps. So I ended up getting a second pump (Sicce Syncra .5) and putting it down into the center return compartment. Managed to fit it in next to my main display return, a Sicce Syncra 2.
I got a small 1/2” street elbow from Lowe’s and threw it on the pump. Connect the pump to Apex, and now just keep it running constantly. At first, it pumped out a TON of gunk into the display, which had me nervous. So today I did around 80-90% water change, siphoned, and scrubbed out the back chambers.
I also got a piece of acrylic sheeting from Home Depot and crudely cut it to fit the center chamber in the rear. Cut some slots for the return lines and a couple cables, and drilled some holes for water to pass through. However, this time I put a piece of pinky floss to fit the space.
Actually really pleased with how it turned out, and hoping that the circulating pump in the main compartment combined with reduced ability for detritus to settle in any of those back chambers should help fix my nutrient problems.
Finally started using a little purigen as well, per LFS recommendation. Running along with carbon and GFO in the media caddy for now. We’ll see!
Some pics below to illustrate, along with a semi recent pic. Despite a little algae everything has been growing extremely well and I’ll need to start trading/upgrading some of these frags and small colonies.
