calcium reactor media ?

[vr697getta]

i bought ARM media for my Deltec PF509. on the container it says for all reactors but someone said it might be to big for my ca reactor. from what i understood most people didn't like the small media thats why i went with ARM.
does any one use this reactor and have they had trouble with this media.
thanks roland

 

[vr697getta]

i also replaced the bump with a maxi 600 not sure if that makes any difference