Rock, rock, and more rock.
Always willing to give advice, especially on a topic I enjoy (always question it though, I'm still behind the times a bit but trying to catch up). I'd love it if more folks who are reading this thread piped up and through out thier thoughts. Or .. atleast pointed out obvious faults in what I've thrown out here so far. :S
How much rock is enough? How much rock is too much?
When I first started reefing it was all the rage to darn-near fill a tank with rock, basically starting a couple inches back from the front and going all the back and most of the way up the back wall. This created a fairly stable tank that, in combination with a deep sand bed, could soak up a lot of unintentional abuse ... right up to a breaking point where the tank would crash.
So, why did a lot of these system perform well and then crash? The more live rock you have the more surface area you end up with for bacteria to grow. Unfortunately, this almost guarantees that you will have dead (low/no flow) zones behind and within your rock work. When this happens you can end up causing detritus to be deposited in area's you can't reach/clean easily (basically making small waste-factories).
So, what do people tend to do now to avoid the crash?
- avoid deep sand beds; shallow (1" or less) or no sand bed tanks tend trap less detritus, and most DSBs never did cycle waste like people thought**
- place rock in ways where water can cycle in, around, and behind the rock so that detritus stays suspended in the water column and hopefully makes it your your skimmer/filter
- manually remove waste if, despite your best aquascaping efforts, you still can't get rid of that one annoying dead zone/detritus resting spot
**: The NSB/DSB/SSB debate cane still be found all over the net. They're interesting reads but if you're starting out, I'd suggest a shallow/no sand bed tank (I like the look of sand personally, but tastes differ). You really don't want to have to remove a 6" sand bed (and you're tanks small enough to where that much sand would really eat up a lot of your water volume).
Alright, so with those few things in mind, here are some personal
suggestions to help you determine how much live rock to have in your display:
- use open/airy rock if it's available, the type of rock used will determine flow patterns (in/around or blocked) and overall bacteria surface
- keep a couple of inches of space on all 4 sides (you don't have to, but it makes cleaning the glass and ensuring flow MUCH easier)
- if you have or plan to keep, open-water fish, leaving at least 2/3 of the tank open is a good thing to consider in smaller tanks (so far, the Clowns and Damsel wouldn't require that, the Anthias' definitely would)
- consider what coral's you're going to keep, how often will they need to be pruned/fragged to avoid growing out the top, into the glass, etc
- most importantly, what really appeals to you ?
That last one's a big one for me. If I don't like looking at it, I will constantly be in my tank re-arraning, "accidentally fragging", and potentially making the whole situation much worse (this is bad, m'kay? .. though slightly addicting). If it ends up you like the look of a spartan (rock wise) tank, that's not a terrible thing and will probably make your life easier. However that might limit your total bio-load processing ability.
What are some ways to adjust your build for medium to high bio-loads and little in-tank bio-filtering?
- frequent water changes, it takes time and sweat, but few things can have a larger effect on tank parameters
- add a sump (effectivelly increasing your water volume and allowing for additional equipment)
- use a skimmer
- implement filter socks, and change/clean them regularly
- add a refugium or algae scrubber to allow for controlled growth and easy removal of excess nutrients
- use activated carbon (activated carbon, depending on its type, has a ridiculous amount of surface area but should be used to basically polish the water), expect it to last only a few days to a week but for your tank you'll probably only need about 1/2 cup to a cup per-week (dending on type)
- consider adding a reactor to hold GFO (phosguard)
- consider high-surface volume products like MarinePure (even more surface area for bacteria) and similar techs (generally these require low water flow)**
**: I've never used MarinePure but I did read a few folks saying it releases aluminum into the water, which has a direct/negative impact on the "Leather" family of soft corals. So, you may want to avoid it or look for other, similar products that don't have that side effect.
Edit: Oh, and, if it comes down to it, a hammer + chisel / flathead screw driver can really do a number on live rock (aka, makes quick fragging work and easy-to-glue pieces). Doesn't always leave it pretty though.
~V