LPS Tank: Pre Game Plan vs. Goal Line Audibles | 90/10 Method
Every LPS Reef Tank Build starts with a plan… and then reality shows up. In this build, we walk through how the 90/10 method helps you get 90% right with proven principles, while leaving room to make smart adjustments when things don’t go exactly as planned.
This Fiji Cube 76g setup is all about balancing simplicity, performance, and long-term reliability without overcomplicating the system.
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Below is a 60 second preview of: LPS Tank: Pre Game Plan vs. Goal Line Audibles | 90/10 Method
Quick Links:
FijiCube 76: We are turning it into a AIO
Axis 20: Used because it is small.
Apex Controller: Will manage our auto water changes and monitoring
Adaptive Controller Cabinet: Electrical is clean and safe.
Tunze ATO: What we trust the most
Avid Aqua MTO & MPO: Clean tubing, wires and probes with strong magnets.
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The 90/10 approach to reef tank success
The idea is simple: follow proven methods for most of the build, then make small “audibles” where your specific setup requires it.
In this case, those audibles included:
• Running slightly outside the typical tank size “sweet spot”
• Designing an external all-in-one system instead of a sump
• Simplifying equipment to reduce failure points
Why we didn’t use a sump
Sumps add flexibility, but they also add cost, complexity, and more potential failure points. Many newer to intermediate reefers are simply not ready for the cost or complexity and it has been well established that you can have a successful reef without a sump.
For this LPS Reef Tank Build, we wanted:
• Fewer pumps and plumbing paths
• Less noise and easier maintenance
• A cleaner, simpler system
At the same time, we built it so a sump can be added later if needed. Future proofed!
External all-in-one concept
Instead of a traditional all-in-one tank or sump, we created a hybrid approach:
• External overflow for surface skimming
• Hidden compartment for probes, ATO, and dosing
• Closed-loop style return
This keeps the display clean while maintaining flexibility and control.
Key equipment decisions that matter long-term
Return Pump:
We tested multiple options and landed on a pump with a simple, linear flow path for easier installation and reliability.
ATO (Auto Top Off):
We chose a proven system we trust over newer, untested features. Reliability always wins here.
Heater Placement (critical lesson):
Originally planned for a hidden compartment, but we moved it into the tank after recognizing a failure risk if water levels drop.
→ Never rely on “it should stay submerged.” Plan for failure scenarios.
Simplifying filtration and maintenance
Instead of complex reactors and extra pumps, we used filter bags for media like carbon and GFO.
It’s not perfect, but it’s:
• Easier to maintain
• Good enough for stability
• Less prone to failure
Controller and automation strategy
We use automation to reduce daily effort and improve consistency:
• Feed and maintenance modes
• Auto water changes
• pH and temperature monitoring
• Power tracking to catch issues early
At the same time, we avoid overcomplicating things with unnecessary sensors or fragile setups.
Build lessons that matter most
• Simpler systems are often more reliable
• Every added feature is a potential failure point
• Plan for what happens when something goes wrong
• Flexibility is more valuable than perfection
• The best builds balance function, simplicity, and adaptability
What’s next
With the system fully set up, the next step in this LPS Reef Tank Build is the aquascape using Ecoscape-style rock and dialing in flow, lighting, and coral placement.
Final takeaway
The 90/10 method isn’t about perfection. It’s about building a reef tank that works in the real world.
Follow proven methods, make smart adjustments when needed, and focus on long-term success over short-term complexity.
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