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10% off Sitewide Starts Now!

Presidents Day Pre-Sale: 15x REWARDS! 2 Days Only: Earn 15% cash back on most purchases!

Perfect Pairs: Sweet Separately, Better Together! Happy Valentine’s Day!

Shop by Tank: Select Your Tank. See Compatible Accessories! Find upgrades for your all-in-one aquarium quickly and easily!

Neptune Systems: EARN 10x REWARDS! Earn 10x Reward Points on any Neptune Systems purchase for a limited time! Take advantage now while supplies last!

Cobalt Aquatics: 15% off Everything! Save on pumps, heaters, food, and more! 10 helpful ways to use versatile MJ pumps for your reef tank

Tank Profile: Mike's 120 Gallon Custom Mixed Reef Check out the animals and equipment that make Mike's tank so special!

Plus 5% cash back in reward points! :thumbsup:

Great choices! Just FYI the light is already 10% off, so it won't qualify for the coupon (although the savings would still be the same either way).

Awesome! Thank you so much for shopping with us. What'd ya get?!?

TODAY: 10% off your order! Save 10% on nearly every item we carry (just shy of 4,000 products) today with coupon code 1DAYDEAL Offer cannot be combined with other coupons or discounts. Excludes items that are out of stock, drop shipped or already on sale. Brands with MAP pricing are...

New in 2017 Get the latest aquarium innovations now @ MD!

Drop-Off Tank Build - Episode 2: Sump Install + Which Rock Should We Use? Vote for the rock you think we should use to aquascape this tank! CaribSea Life Rock or AquaMaxx Dry Live Rock?

PICK YOUR DISCOUNT: $5, $10, OR $20 Pick your discount + 10% cash back on most items until 1/31/17!

Win a Tunze Nano Reef Prize Pack (a $375 value!) To help keep your tank healthy and looking its best, we've teamed with one of the best in the biz to give away an amazing Tunze Nano Reef Prize Pack! One lucky hobbyist will receive: Tunze Osmolator Nano 3152 Tunze NanoStream 6040 Controllable...

Selcon Food Booster, FR-Series Reactors, and Oceanexus Frag Racks More fast facts about our customers' favorite products!

Top-Selling Pumps: ALL $5 OFF! TODAY: $5 off popular pumps + 10% off heaters!

Drop-Off Tank Build - Episode 1: Help Us Pick a Sump! Vote for the next piece of equipment we add to the tank! Trigger Systems Emerald Sump or Marine Depot Prototype Sump?

The Best Nano Reef LED Lights Under $400 Here are our 4 favorites + 1 :D Let's discuss!

ICYMI: Marine Depot Blog Posts - January Roundup How Often Should I Change My T5 Bulbs? Introducing Marine Depot Rewards + Get 10% Cash Back on Most Purchases This Month Poly Filter Chemical Filter Media Pads: What YOU Need to Know Neptune Systems WXM Module for Wireless VorTech/Radion...