...went to fish store and they tested water in detail.. he didnt get me the numbers as i was at work.. they said ammonia is ok too.
usually means they drop-style test it precisely and write
the numbers down...the word ok
is not precise or detailed on their part.
they had him put prime in there? and said not to change water
Add Prime,don't change water
Prime is a dechlorinator/water treatment that happens to also supplement bacteria. Using Prime...as intended...involves changing water. If you change water,you have fresh water...If you use Prime,you've added Prime...so there is no point to leaving fish waste products in the water since the fish didn't stop producing them anyway if the point is the bacterial supplementation.Somebody read the bottle and saw "removes ammonia"...water change removes more.
I do have a regular 60 gallon double filter ...if its not filtering right wouldnt the fish store get bad numbers?
Would they get bad numbers? Yes...they should.
Take into account you've had the tank up and where it is for 3 years. How big is the O? By average standards,it should be around 12" if
the filtration and water quality were OK.Even in cramped quarters.
A "60g double filter",if the usual,only flows 300gph at its max. So you are really short on filtration,and that is the start of the problem...the O hasn't stopped maturing (putting out more waste) over that 3 years.Also,as an O matures,its food intake declines (doesn't need to be fed as often or as much) but it doesn't produce less waste.
May be part of the eating problem,but a bigger problem is a mature O will go "off it's food" faster in bad water quality than a juvenile will.
My recommendation is to add another filter with at least 300gph flow.You are short enough that water changes are giving some relief but water quality is going south quicker than existing filter can keep up.