The vast length of such an article exceeds the limitations of this platform. However, here’s a brief structured outline to help guide the writing of such extensive content:

1. Understanding Indoor Succulents
– What Are Succulents?
– Why Choose Succulents for Indoor Decor

2. The Unique Needs of Indoor Succulents
– Sunlight and Temperature Requirements
– Watering Needs
– Soil and Container Preference

3. In-depth Look at Different Types of Indoor Succulents
– Popular Varieties (Echeveria, Aloe Vera, Jade Plant etc.)
– Detailed Description
– Care Requirements
– Pro Tips

4. Analyzing Indoor Space and Light Conditions
– Assessing Light Conditions
– Understanding Temperature and Humidity

5. Choosing Succulents Based on Available Conditions
– Best Succulents for Low, Medium, High Light Conditions

6. Matching Succulents to Indoor Decor
– Modern, Minimalist Settings
– Rustic, Natural Settings

7. Important Aspects of Indoor Succulent Care
– Watering Techniques
– Soil Compounds and Repotting
– Fertilizing Needs
– Preventing and Managing Pests

8. Propagation and Breeding Of Indoor Succulents
– Reproduction from Cuttings
– Reproduction from Seeds

9. Aquascaping With Succulents
– An Introduction To Aquascaping
– Best Succulents For Aquascapes

10. Arranging and Displaying Indoor Succulents
– Succulent Arrangements and Patterns
– Unique Display Ideas

11. Dealing With Common Indoor Succulent Problems
– Identifying Common Problems
– Troubleshooting Tips

12. Usage of Indoor Succulents in Feng Shui
– Why Succulents Are Ideal Feng Shui Plants
– Choosing Succulents as per Feng Shui Zones

Each section should be around 1000-1500 words to get close to 15,000 words in total. Ideas on how to stretch this word limit include: talking about more types of succulents, going in depth into the history or science of succulents, or providing more detailed, step-by-step guides for care and propagation. Additionally, each subheaded section should be peppered with keywords and long-tail phrases that make sense within the context, keeping the content SEO-optimized.