Best Salt Water Tank Sump Solutions for Reef Tanks
Finding the right sump setup is essential for stability, filtration, and growth in saltwater and reef aquariums. This guide highlights five sump kits and related systems designed to optimize filtration, refugium space, and equipment layout for popular tank sizes. Each option focuses on adjustable water levels, compatibility with common tank dimensions, and flexible configurations for skimmers, reactors, and refugia. Use the quick reference below to compare features and suitability for your system.
| Product | Tank Type / Size | Adjustable Water Level | Notes |
|---|---|---|---|
| Adjustable Sump Baffle Kit – Refugium Kit for 20 Gallon Long | 20 Gallon Long | 4–8 inches | Customizable space for skimmer, reactor, refugium |
| Adjustable Sump Baffle Kit – Refugium Kit for 10 Gallon | 10 Gallon | 5–8 inches | Designed for Aqueon 10 gallon glass tank |
| Adjustable Sump Baffle Kit – Refugium Kit for 40 Gallon Breeder | 40 Gallon Breeder | 8.2–14 inches | Designed for larger water volumes; flow direction adjustable |
| IceCap 36 Reef Sump | Large Reef Systems (up to 190–220 gallons) | 5–9 inches | Spill-over design; probe holders; multiple chambers |
| Fluval Evo XII Saltwater Kit | 13.5 Gallon Kit | N/A | Integrated filtration with LED lighting; compact system |
Introduction to the products below includes a brief overview of each sump or kit, emphasizing compatibility with common aquarium setups, filtration capacity, and ease of configuration for protein skimmers, media reactors, and refugia. The selections aim to cover a range of popular tank sizes while maintaining clarity about space requirements and adjustability for optimal performance.
Adjustable Sump Sump Kit for 20 Gallon Long

The kit is designed for filtration in saltwater aquariums with customizable space for protein skimmers, media reactors, refugia, and other equipment. Water level is adjustable from 4 to 8 inches to suit skimmer requirements. It is suitable for Aqueon 20 gallon long glass tanks or interiors between 11.8″ and 12.1″ wide, with space needed on both sides for glue. Ensure tank measurements before purchasing.
Adjustable Sump Kit for 10 Gallon Tank

This refugium and sump kit supports filtration in saltwater systems with customizable space for equipment. Water level adjusts between 5–8 inches to match skimmer usage. The design targets Aqueon 10 gallon glass tanks, or tanks with an interior width of 9.85–10.2 inches. Please measure your tank before buying.
Adjustable Sump Kit for 40 Gallon Breeder

This kit is designed for larger saltwater aquariums with adjustable water levels from 8.2 to 14 inches. It supports customization for skimmers, reactors, refugia, and other equipment. Tank width suitability ranges from 17.45 to 17.75 inches. The second dividing plate allows control of water flow from top or bottom. Includes space for a precipitation tank and a high-grade board, with reserves for a filter box.
IceCap 36 Reef Sump

The IceCap 36 Reef Sump is built around modern reef aquarist needs. It features a spill-over design in the micron bag compartment with lids for quiet operation. It accommodates skimmers, heaters, return pumps, and reactors, with adjustable baffles and probe holders. Suitable for aquariums up to 190 gallons, and practical up to 220 gallons. Dimensions: 36″ x 18″ x 16″ tall; skimmer chamber 17.7″ x 15.2″; return chamber 8.7″ x 9.8″. Drain bulkheads: two 1.5″.
Fluval Evo XII Saltwater Kit

The Fluval Evo XII is a 13.5 gallon glass aquarium kit designed for saltwater fish. It features a stylish honeycomb design concealing the rear filter compartment and water line while maintaining a modern aesthetic. The kit offers powerful three-stage filtration with oversized mechanical, chemical, and biological media for efficient filtration in compact setups.
Buying Guide
Important purchase considerations for saltwater tank sumps include:
- Tank compatibility: Check interior width and overall dimensions to ensure the sump fits beneath or beside your display. Measure tank width, cabinet clearance, and stand space before buying.
- Water level adjustability: Look for adjustable ranges that align with your protein skimmer, reactor, or refugium needs to optimize flow and skimming efficiency.
- Filtration configuration: Decide whether you need space for refugium, protein skimmer, reactors, and return pumps. Sumps with flexible baffles or removable panels offer future-proofing as equipment changes.
- Material and build: Acrylic sumps are lightweight and easy to shape but can scratch; glass sumps are sturdy and inert but heavier. Consider cabinet support and weight distribution for larger setups.
- Flow and return options: Ensure there are provisions for return pump placement and an adjustable flow path. Some designs offer top-down or bottom-up flow control to manage precipitation and debris.
- Maintenance and access: Choose designs with easy-access panels, thick walls, and clear labeling to simplify cleaning and skimmer maintenance.
- Expansion potential: If you anticipate upgrading to larger tanks or adding more equipment, prioritize sumps with additional chamber space and modular baffle options.
- Brand and warranty: Reputable brands with clear installation instructions and warranties help reduce setup risk for reef systems.
These considerations help ensure reliable filtration, stable water chemistry, and flexible setup for both beginners and experienced hobbyists. When selecting a sump kit, align your choice with your current tank size, equipment lineup, and long-term reefing goals. Always verify measurements and compatibility with your specific tank model before purchasing.