Ive talked to a lot of people just getting in to the hobby who wanted to do a fowlr. The problem is that they get alot of advice on how to do a f.o. tank and forgt they have the live rock.
Filtration:
If you are going to put 100lbs of live rock in the tank you need to treeat the system as if it were a reef. Granted you are not going to need a calc reactor or super intense lighting, but for filtration purposes you want to treat it like a reef. If you're wet/dry has room for a skimmer you can still use it, just take out all of the bio balls. Find a pura pad that fits in your drip tray and use that instead of the sponge/pad in there now. you can also run some phos guard or phos band in a media bag where the bio balls used to be.
Skimming:
If you've had trouble in the past (it sounds like you have), try over skimming. What I mean by this is as follows: Try and find a skimmer that states it can handle a 200 gal or more system. What skimmer to get depends on how much room you have. check out what other people are using and when your ready to order something post it first and get some more opinions. If I was going to buy a new skimmer Id call reefgeeks and see what they suggest, theyve helped me out alot in the past and they are one of the few online sites i trust to order stuff from. I dont work for Reefgeeks so this endorsement is based purely on my experience buying from them. If i was going to buy a used skimmer id pm nyreefnoob cus im sure hed have something good lying around lol.
Make sure you have good water movement over your live rock since in a reef tank or fowlr the rock and sand is where most of the denitrification is going to take place.
Water changes:
I personally like to do about 10-15% a week depending on what my levels are. Even 5% a week is probably sufficient if you make sure to do it EVERY week. Its better to do smaller water changes more often then to do big water changes once and a while. Since your not keeping corals just about any commercial salt should be fine (Id suggest oceanic). I make my water the day before i plan on using it and once its mixed i run an airstone in it (helps salt dissolve and increases O2) It is important to use ro/di water to keep nutrient levels low. I dont have a unit (no room in my apt.) so I struck a deal with a nearby reefer for $20 a month he makes me 10 gallons a week. If you cant get an ro unit for w/e reason talk to your lfs or another reefer and see if you can work something out. Its a huge pain in the a$$ but its THAT important
Supplements:
Since you have live rock you are going to need a two part calcium supplement. ESV b ionic is what i would use. Follow there minimum dosing reccos since theres no coral in the tank. I would also pick up a bottle of trace elements and follow the minimum dosing on that as well. To get started you might also want to consider a bottle of mb7 by
brightwell. Im not a huge fan of brightwells stuff but the bacteria (mb7) is worth picking up. It will jump start your biological filter and help replace bacteria removed by water changes/skimming. Saltwater decholrin
ator (even if you use ro its good to have a bottle on hand). Whenever I have to put my hands in the tank (do this as little as possible) I wash my hands then pour a little dechlorinator on my hands and spread it around.
Test Kits/tools:
Ditch the hydrometer and get a
refractometer. You need tests for the following: Calcium, Hardness, PH, Ammonia, Nitrite, Nitrate, Phosphate. By staying on top of what the levels are in your tank you are going to remove a lot of guess work from the equation, itll also build your confidence. Youll need several buckets w lids, an air pump and stone (for new water not for tank), enough powerheads to turn your tank over 10x an hour. And probably some other stuff Im forgetting
Setting up from scratch:
fill the tank about 3/4's of the way and mix the salt right into the tank running the powerheads and heater. Once the salt is dissolved and your specific gravity is 1.023-1.025 add your sand. Be carefull while adding the sand, aragonite can burn the glass and leave a scratch at the surface of the water, so make sure a powerhead is pushing the water around at the surface to keep the foam from the sand from burning your glass. Once the sand is in add the rock make sure you place them securely and if you are not bonding them together dont stack them in a way that can lead to a collapse. Make sure and leave enough clearance from the sides so you can clean the glass. Once the sand and rock is in top off the tank with premixed water and start your filtration. The suspended aragonite is going to make your skimmer go nuts and might require you to clean any pads or sponges.
When the water is clear and the temp. is correct check your levels make any adjustments you need to then add a cube of mysis and a capful of mb7. DO NOT put live stock in your tank yet (*There are a number of ways to cycle a tank Im just going to go over how i do it) What you can add and I actually reccomend doing this is adding some chaeto or garciaris (seaweed for lack of a better term) avoid calurpa cus it has a tendancy to go sexual and dump all of its chlorophyl and bound nutrients into the water every once and a while. These plants will assist in nutirent reduction, the provide habitat for microfauna, and are laden with beneficial bacteria. Now that the tank is set up wait ATLEAST 2 weeks (3-4 weeks would be even better). During this time feel free to top off the system to deal with evaporation (just use fresh water since salt doesnt evaporate and continue to monitor your levels). Im not gonna explain the ammonia/nitrogen cycle cus you can just google it, but even if you dont notice a spike in ammonia or nitrite you still wanna wait for as long as you can stand it.
When youre finally ready to add fish, select a hardy species (many stores try and sell you damsels for this but dont add a fish to your tank that you dont want as a long term resident) start off with maybe 1/5 of the total number of fish you want to keep. Take your time and plan ahead , add less aggressive species first so they can establish a territory. After you add your first fish monitor the levels closely for the next week or so, if things remain stable begin your routine of water changes and continue to add fish. *a note on adding fish, less is more sometimes and this is one of those situations do not overload the tank with fish. Youll see more natural behavior and have happier healthier fish by giving them more space to roam. Im doing a 120 pretty soon and I only plan on keeping 8 small fish (under three inches). If you want larger species like triggers, puffers, etc. you need to budget even more space for them since there bioload is significantly more than an equivilant length of smaller fish.
Im tired of typing but this should get you started. Just remember to test ur levels, do your water changes, and most importantly be patient. Feel free to pm if you have any questions