DB, I don't have nearly the experience as the more experienced ray keepers such as you on here @ 3 years or so, and have only had one occasion of something like this. Both marbles stopped eating out of the blue for 7 days. I even PM'd you about it. Really the only thing I did was two water changes and waited to see what happened. They turned around in about 8 days and started eating. To this day I don't know why. Params were all within normal range.
As for as the filtration, I run a 145 gallon sump which has never been cleaned in a year. I have 2x 100 micron socks on the out flows to the sump and is returned with a mag 24. I also run two FX5s and only clean them 2-3 times a year. Stock includes 6 rays one VATF and the Fahaka in the sump. I also keep water well agitated with 2x 1200 gph water circulators. I am a more of an old school style ray keeper. Not up on all the newer setups.
My point here is I also agree that you have ample filtration.
Also as for as Dents. I had a conversation with a importer from another board (whom a lot of members on MFK don't care for) about this on an occasion, he is a firm believer that the head dents are stress related and not from lack of food. Whether this is accurate or not I don't know, I am just passing this on.
And no need for apologies. Some outburst were deserved. Hoping for the best.
As for as the filtration, I run a 145 gallon sump which has never been cleaned in a year. I have 2x 100 micron socks on the out flows to the sump and is returned with a mag 24. I also run two FX5s and only clean them 2-3 times a year. Stock includes 6 rays one VATF and the Fahaka in the sump. I also keep water well agitated with 2x 1200 gph water circulators. I am a more of an old school style ray keeper. Not up on all the newer setups.
Also as for as Dents. I had a conversation with a importer from another board (whom a lot of members on MFK don't care for) about this on an occasion, he is a firm believer that the head dents are stress related and not from lack of food. Whether this is accurate or not I don't know, I am just passing this on.
And no need for apologies. Some outburst were deserved. Hoping for the best.
I'll have to see if I can find a source for the scope and the ability to ID any unwanted intruders in said poo. 