Looking for protein skimmers and pumps for aquarium applications.  
Key requirements:  
1. Require initial samples for quality testing  
2. Subsequent orders will be approximately 40 pieces per order across 3 different sizes  
3. Need product specifications and compatibility details  
4. Seeking suppliers with aquarium-specific equipment manufacturing experience  
5. Market consideration: Current aquarium equipment demand is more selective compared to previous years  
Please provide:  
- Available product models with technical parameters  
- Sample availability and cost  
- MOQ for different sizes  
- Production lead time  
- Competitive pricing structure