I have a 90g w/a large 40B sump/fuge. Would the Geo 510 be plenty or is the 612 the way to go? I know nothing about reactors but am tired of Kalkwasser. Also would a reg ph probe be fine or would it be better to go pro?
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Don't overthink it. I know you have a great setup.
Use it and enjoy. If you feel something is missing then come back and we can offer more help.
I like the rack you put the other stuff in. I may try to emulate it if I cant fit it in the sump. Great pic btw. Helpful. And yes, George and Mark were great.George is a great guy to work with. You will love your reactor.

do you use a controller? How are you going to monitor the ph inside the unit? Instead of controlling effluent flow you can vary the ph inside the reactor to dial it in as well
An update and a question:
To maintain a smaller footprint, George built the rx you see below. Pretty, I think. A recent FTS is also provided.
You guys were right on about everything. Due to expense and space restrictions, I decided to hold off on the Peri pump but, I really wish I had one now. I ended up with a Sicce and MJ 1200 to run the reactor. The Sicce is a bit loud for me but I dont know if the eheim would have been any better. Soon as I put it in, I noticed an improvement in the growth of everything. As you guys stated, the MJ works but it can clog up at times and isnt the most consistent thing. As a result, I run the effluent rate at about 45 ml/minute.
Now for the question:
It worked well until recently. Lately, I've been having a tough time maintaining Alk. I've supplemented w/Kalkwasser and baking soda but that seems a bit wrong given my tank is only 90g and it's not FULL of SPS. The pH inside the reactor is set to 6.5-6.52. I was getting about 12.5 dKH measurement on the effluent. The reactor is filled with extra course ARM. Not sure if it’s diluting but I’m also doing automatic water changes at about 2 gal/day.
Any idea?
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Note that this in not an sps filled tank.
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