They HELP to get of phosphate (sp)?
the thing is with saltwater. WATER is the KEY...
in order to have a VERY nice tank with proper growth of correct algae (not green as you would think) green is bad even it starts the BAD cycle of algae choking corralling based calcium.
heres the best way to do this (although it is expensive) but intern its less maintenance with salt water (IF that can be even said)
You need to start with PURE water (reversed osmosis water...and or ionized or a combo filter that does both) I got 1 KENT MARINE
ITS AROUND 470 FOR THE KIT.
it does PERFECT laboratory water. Then from there you mix in a good quality base saltwater mix. high in calcuim. from there you got the perfect start.
NOW water does evaporate there for you need to replenish that water (WITH FRESH WATER...not fresh salt water) the salt doesn't go away, only the water. In this time of water evaporation...your salinity goes up (saltwater content) that's why you have to monitor this. and add fresh water.
THE BEST way to do this is by fresh r.o. deoinized water with a mixture of calcium addititve. usually in powder form. make the mixture let it settle for a day, and skim the clean water that's on top and don't let the chalky pasty water inter the sump (water filtration system) this makes up that water, and also helps stabilize the calcium balance. (1 of the MOST inportant bases in saltwater) once you get the calcium levels around 400 you will start to get purple, pink, and Florissant green algae coating on the tank. it looks beautiful then when you start having clams and shell fish...this has to be keep at levels correct, then it comes into all the other stuff, nutrient additives, iron, calcium, etc, etc, etc,
Also too when you get this type of tank...monitoring it, becomes a bitch with water test pills and shit, I went to the electric monitors.
Also too ozone generators are WONDER for keeping the water free and clean of diseases and keep the water clean as ice. You REALLY need an ORC monitor for that to base correct levels.
BUT ALSO the BEST thing other then starting with good water and good replacement evaporated water with calcium base mixture is A GOOD PROTEIN SKIMMER that is religiously cleaned. It will take out so much organic waste and cut down on bio load that your fish will kiss you for keeping them alive and less stressed.
also too...i think all my fish stuff Os for sale again...the wife has lost her emotional attachment to them since its been a while. so if ya wanna buy anything let me know or ask for some advise anytime