I have a Waterbox 25 Peninsula Mini with stock nozzle at the moment. Return pump is a Jaebo 1200 DC. I have a wavemaker in the tank, but thinking I might be able to remove it if I got a VCA nozzle.
I couldn't find specs on the Jaebo 1200 for some reason, but I'm going to assume that is rated for 1200 Liters per hour max (around 315 GPH)
1) the recommendation is either a single 1/2" or a dual 1/4". did I read that right? dual 1/2" might be too much flow for such a small tank, right? have you heard feedback from folks who were able to eliminate a wavemaker with this setup?
That is correct - you can go either way - both kits include the 16.5mm Waterbox adapter so both of those kits are capable of attaching to the stock outlet.
However - there are instance where you may choose one over the other. The main driver being the amount of supply side flow you can provide the outlet.
In your case, with a pump capable of 300+ GPH, I personally would recommend the single 1/2in RFG. you'll better be be able to utilize the flow the pump is capable of providing
With that said - both opoto0ns will flow the tank nicely - The single 1/2in will provide a much wider flow pattern, and create water movement more akin to a wave maker, where as as the dual 1/4in RFG will randomize the flow, but because they are smaller, the flow pattern will be more narrow causing the flow to travel further
Both options work well, and it may come down to how your rockwork set setup. If tis taller and in the center , and may block the flow of a single 1/2n RFG, the dual 1/4in may be a better choice.
Regarding the dual 1/2in kit - that particular kit does not come with a suitable adapter for that tank. Also, you would need at at least 600-800 GPH to really tank advantage of a dual 1/2 RFGs. Also, a dual 1/2in RFG setup would take up a considerable amount of room in the tank of that size.
2) if I want to spread the flow around the tank and go with the dual 1/4", can I remove one of the knuckles and move it to the other side? does it screw up the RFG pattern?
You can remove knuckles from the dual 1/4in kit. the only effect may be that you end up sending more flow to the RFG that has less resistance (fewer knuckles) . But, with the the pump turned up, it probably will not be noticeable .
3) lastly, will this kit have everything I need for the Waterbox 25 peninsula?
Yes - and there is no disassembly of the tank plumbing - other than to pop-off the flare nozzle on the end of the outlet.
This is a diagram showing a single 1/4in RFG kit is installed on this tank, but the concept is the same for all 3 kits we offer for the Waterbox Cube Mini tanks.