Once a marine tank’s filtration, lighting, and skimmer are sorted, a second tier of equipment starts to matter: the accessories that automate routine maintenance, stabilize water chemistry between water changes, and keep equipment running longer. None of it is strictly required to keep a tank alive, but each item on this list solves a specific, recurring problem that would otherwise eat into your time or your tank’s stability. Here’s what’s currently in stock, grouped by the job it does.
Automating Top-Offs and Dosing
Evaporation tops off differently every day depending on humidity and photoperiod, which makes manual top-offs one of the easiest routines to fall behind on. The Red Sea ReefATO+ Auto Top Off System automates this with optical sensors, and the Red Sea ReefATO+ Upgrade Kit adds the same automation to an existing Red Sea Reefer aquarium’s sump.
For dosing calcium, alkalinity, or trace elements on a schedule rather than by hand, the Red Sea ReefDose 4 Dosing Pump runs up to four independent dosing lines, and the Jecod WiFi Dosing Pump 3.4 adds app-based scheduling and adjustment from a phone. If you’re already running a ReefDose system, the ReefDose Deluxe 4-Color Tubing & Accessories Kit (in Red-Yellow or Blue-Green color coding) keeps four dosing lines visually distinct so you don’t cross-connect reagents during maintenance.
Water Movement
Steady, randomized flow keeps detritus in suspension long enough for mechanical filtration to catch it, and prevents dead spots where coral tissue can stagnate. The Sicce Voyager HP-8 and Sicce Voyager HP-10 Stream Wavemakers are submersible pumps built specifically for directional flow patterns in reef tanks, sized for small-to-mid and mid-to-large systems respectively.
UV Sterilization
A UV sterilizer clears free-floating algae and pathogens from the water column before they can establish in the tank. EHEIM’s ClearUVC line covers a wide range of tank sizes (the Eheim ClearUVC-24, ClearUVC-36, and ClearUVC-60) while the larger EHEIM Reeflex UV 1500 and Reeflex UV 2000 step up to bigger systems needing higher flow-through capacity, though both are currently out of stock at IndieFur. For larger systems right now, the ClearUVC-60 above is the largest EHEIM UV sterilizer currently in stock at IndieFur and a reasonable starting point until the Reeflex range is back.
Calcium Reactors
For reef tanks that have outgrown liquid or powder calcium dosing, the Deltec Fluidized Bed Calcium Reactor line (PF501, PF509, and PF601) dissolves calcium media using CO2 injection, supplying calcium and alkalinity continuously rather than in periodic doses. All three sizes are currently on backorder; check the product pages for the latest availability.
Ozone and Water Clarity
The Enaly Ozone Generator OZAC-PLUS 200 oxidizes dissolved organics and improves water clarity beyond what mechanical and biological filtration alone can achieve. It’s best paired with a protein skimmer and an ozone reactor or venturi, since ozone needs proper reaction time and off-gassing to be used safely. For the sump-side plumbing that pairs a fleece roller filter into an existing setup, the Red Sea ReefMat Sump Modification Kit adapts a standard sump to accept one.
Live Feed Support
For tanks feeding filter feeders or fussy fish, Ocean Prime Copepods are available in a 2mm size and a smaller 500-700 micron size, giving a live food option scaled to different mouth sizes across a mixed reef tank.
Handling and Frag Tools
Rounding out the smaller accessories: ISTA Instant Glue (also in a 25-tube pack) bonds coral frags to plugs or rock underwater, the ISTA Coral Frag Plug 10-pack gives you mounting bases on hand for fragging or rearranging a tank, and the ISTA Hydrometer is a simple, inexpensive way to spot-check salinity alongside a refractometer.
Precision Dosing for Smaller Systems
For nano and pico reef tanks that don’t need a full four-channel dosing pump, Aquavitro Sentia Doser Primary and Sentia Doser Secondary units scale dosing automation down to smaller volumes: the primary unit runs standalone, and secondary units expand the system one dosing line at a time as needs grow.
Quick Reference
| Problem | Product |
|---|---|
| Manual top-offs eating into your routine | Red Sea ReefATO+ System / Upgrade Kit |
| Hand-dosing calcium/alkalinity daily | Red Sea ReefDose 4, Jecod WiFi Dosing Pump |
| Dead spots / poor flow | Sicce Voyager HP-8 / HP-10 |
| Free-floating algae or pathogens | EHEIM ClearUVC, EHEIM Reeflex UV |
| Outgrowing liquid calcium dosing | Deltec Fluidized Bed Calcium Reactor |
| Water clarity beyond mechanical filtration | Enaly Ozone Generator OZAC-PLUS 200 |
| Feeding filter feeders / fussy fish | Ocean Prime Copepods |
| Fragging and mounting corals | ISTA Instant Glue, Coral Frag Plug |
| Nano-scale automated dosing | Aquavitro Sentia Doser |
Prioritizing What to Add First
None of these accessories fix a struggling tank on their own; they remove recurring manual tasks from an already-stable one. If you’re deciding where to start, automate the task you’re most likely to skip: top-offs and dosing tend to be the first casualties of a busy week, which makes ReefATO+ or a dosing pump the highest-leverage first purchase for most reefers. UV sterilization and calcium reactors solve more specific problems (persistent algae blooms, or outgrowing manual calcium dosing) and are worth adding once you’ve identified that particular need rather than buying preemptively.
