New to reefing.

[Myka]

They do add to your bioload, but not nearly as much as a fish does. There isn't really a rule. The 1 per gallon thing is a joke...they'll starve to death. Start with a couple of each type you want to try and go from there. My Astreas have been very hardy. I bought three when I first set up my 33g in Dec 06, and they're all still going strong. They are an uncommon species called Astrea caelata. To give you an idea, I have 14 snails in my 33g. I also have an Orange Lip Conch. I find my Astreas, Margaritas, and Conch do the most work. The Nassarius population rotates due to them dying off (maybe 50% per year), Cerith as well although at a lower rate (maybe 25% per year). I don't find the Nassarius do a whole lot, other than picking at uneaten fish food, but my Peppermint shrimp does just as a good a job. The Nassarius also churn the sand a bit, but I find my Conch does 10x better job of that! I won't replace my Nassarius or Cerith in the future. So here's a breakdown for you:

Orange Lip Conch - churns the sand, keeps the sand clean, cleans the lower 1 1/2" of the glass (as far as he can reach haha)

Margaritas & Astreas - I think do pretty much the same thing, which the Margaritas being a bit more efficient. They do a good job of the green & brown algaes on the glass and rocks.

Cerith - stick to the glass, and don't do a whole lot.

Nassarius - stick to the sand, and due their small size, don't do a whole lot. They do churn the sand a bit, and eat some fish food, but other critters do a better job imo.

Stomatellas - awesome algae eaters, and will reproduce in the tank. My favourites.

Peppermint shrimp - Pretty much attack uneaten fish food. Good scavengers. Often eat small aiptasia, but also ate my Stomatella snails.

Cleaner shrimp - Good scavengers, will also clean some fish of parasites.

[ElGuappo]

i do have to disagree with the choosing of snails of crabs. i have a 34 G and i have over 20 snails of 4 different types and 15 hermits of 3 different types. i have seen them hassel the snails a little but they are usually able to get away unless they fall and are overturned. i have only lost 2 margarita snails in the 9 monthes ive been set up. all were added at about the same time.

Just my opinion. i do however feed an exces of pellet food once in a while as the hermits and shrimp seem to really like it.

PS i think i have lost more hermits to hermits then snails to hermits. as the 2 billion shells in my tank arnt good enough so they fued all the time.

[angelfan]

Originally Posted by Whatigot

I had a 36 gallon tank as my first reef and my set up was almost identical to yours.
I found that when I had a sponge or floss or anything like that in my cannister I got Algae galore and high nitrates, even after large water changes.
As soon as i took all the media out and just packed it with LR rubble, my tank became very self sustained.

only my experience and yours of course may vary.
cheers.

LR rubble only in my can filter too for 3 years and a very stable system (first reef tank) Also I found the same with floss/sponge