things are shrinking help.
 

things are shrinking

i have a 30 gallon reef tank..... i have noticed recently that some of the corals will slowly stop opening. or they seem to be disenegrating. my whole patch of xenia dissenegrated. my leathers are shrinking. some polyps have dissenegrated.

what could be the problem

How close are all the corals to one another....a FTS would be nice. Maybe some stinging going on?

they are not close at all.

what is a fts? all new to the hobby.

Full Tank Shot

Depending on what kind of corals are in the tank, there might be some stinging going on at night that you're not aware of....

could it be that i have not been doing water changes. i posted another link a few mins ago?\

could water changes be the problem?
 

i have a 30 gallon aquarium. saltwater reef

are water changes needed? i have not been doing any as I am new to the hobby and the pet store told me that they were not needed. they told me just to top up the evaporated water with fresh water and i would be fine.

my question is are:
- water changes needed in my tank?\

- what will happen if i dont do them?

-and when should i be doing them and how much each time.

yes, waterchanges are importat...I answered why in your other topic

so could this be the problem as to why things are shrinking?

the best way to tell is to test your water parameters.

My best guess would be "yes". Waterchanges are the first place we look when things are not right with our tanks.