Fish less reef?

Marine snow, phyto and zooplankton are suitable choices. Just remember that less is more when it comes to feeding your tank as adding too much is not beneficial to your tank. Also, any symbiotic coral will receive most of its nourishment from its host zooxanthellae!
 
I've run a fishless tank for a few years now as an experiment, and have been successful with almost no filtration other than water changes.

I think being able to run a clean nano tank with little visible equipment really highlights the corals, and compensates for the lack of fish. The corals really take center stage and grow like wildfire. Having a clean appearance is difficult and important in a "artsy" nano tank.

I also dislike needing to put a top on my tanks to keep the fish from jumping out.

To each her own!
 
Inspired by your question, I've put a thread up which kind of gives the most basic details of how to and what to: maybe that will help too. It is a perfectly viable choice, and if you have enough worms and crabs and snails breaking down the little fishfood that falls in, the coral has no trouble growing, and growing, once it gets settled, quite fast, as in daily or near-daily changes. Main thing is start your pieces low in the tank to be sure they get adjusted to your lights slowly, bring them up to the point where (as you learn) that kind is happiest, and then glue them down, because corals are sensitive to little shocks and wobbles in the current. They like to be stable. Exception: plate---plate is a stony that actually walks across the sandbed and should never be glued---but in general it's also a more advanced coral---wait on that one.

Best stonies for beginners---lps like hammer, frog, acans, candy cane.
Best softies: zoas, palys (wear gloves: they are toxic, and don't frag ANY coral without eye protection---this is very serious: do not do it!), mushrooms, xenia.
If you are a novice with corals, don't in general start with sps---these are the colored sticks: leave those to the guys who've been doing reefs for a couple of years.
 
Normal fishfood to increase bugs population, their poo increase tank nutrients... even without fishes...

Definitely this thread is changing my point of view.

Tank you!
 
In my nano the bug population became problematic to the point they were irritating my corals and causing them to be closed more often then not. Solution, add a fish (6-line wrasse), still have a few bugs (and a very fat wrasse)but they are far and few in between.
 
Most of the nutrients fish eat come back into the water as waste( excrement and urine).Degaradation by bacteria or processing by critters other than fish has much the same effect.
The type of food you choose for corals in your tank depends on the coral. Those with larger polyps can take larger foods like mysis shrimp. Those wih smaller polyps can eat the larger foods and need some small micron foods or degraded bits of large foods. Some need some phytoplakton ; most need zooplankton. Some ,xenia ,capnella , sacrophyton for example don't exhibit a feeding response and may take the nitrogen, phoshaorous and organic carbon they need by absorbing it from the water. Nutrients don't end with phosphate and nitrogen( carbon, iron, potassium, idodied and others also play into it) Most foods contain a long list of nuteints and trace elements)
 
You may run a tank with no fish but you will not get color and grows like in a reef aquarium with high import/export nutrients. You need animals in your tank in my opinion. We started our frag moduls with only 3 tanks in each 1600 liters system, trust me, me never saw corals happier than when we added more fish. In my opinion, corals need fish (or any other animal in the tank) that eat and poo. That is why in natural reefs you see a lot of fish. Also some fish play a simbiotic role with corals like anthias and chromis or others. The corals provide them with protection and the fish provide corals with nutrients.

So, in my opinion, you need living animals other than corals in your tank to have a colorfull reef aquarium. Specialy with LPS and Soft, they need more nutrients than other corals.

You may also add coral food or amino acids, but what is the point if you can add fish. Poo from fish is the best food ever for corals.
 
Fish waste contributes to the nutrient levels but I wouldn't call fish poo the best food for corals.
 
I'm thinking of doing a coral only/invert tank for qt/ich prevention purposes. What type of filtration do you need? Just live rock?
 
Live rock could be enough, depending on the amount of feeding. I also use a hang on filter with some granulated activated carbon to provide some water movement and fitration. A powerhead to keep the wate moving helpos too.
 
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