I actually don't have any interest to discuss my filtration or tank
I only in that area liked to check out how well a filtration system you managed to put together for a 300 gal tank. Now I been in this hobby for so long and I will not tell you any fairy tales that I know it all and besides that, if anyone ever told you something as that you best not ever listen to anything they too say of you tanks or marine species.
Also what I was looking to see was how well off a filtration system you have for if it is that you not so well off a filtration method, later down the road to what `re it be a year or two, you could then have a serious situation with livestock dropping like flies or just as worse, a crash system.
Now in that area, I been extremely lucky in doing all the best things for when I use to do F/O tanks for some three years or more, I decided to cut out the F/O that I wanted only the eels and reef tanks for the remaining part of my life. But like I said I never had a tank that I had to clean it up because of ich for I QT all my fish, eels in that department in my personal views is not necessary to have to QT.
Also when one wants any moray, when this eel comes into the lfs and has came in the 24 to 30 hours time span one can and could take that eel home right then and there for the part that disrupts the eels from feeding is catch them again and bag them and this takes many eels longer to become settle and to begin feeding. And one needs to take then some three hours to make the eel ready for their tank by using a large bucket with an air line that is from the top (that is works like a Iv) the tank running slowly down into the bucket.
Always before taking home the eel, if they took two days or so to if you cannot tell how they appearance are that then leave them at the lfs for few days only for not bother to wait and see the eel feed for this can be either the same day or months later before it feeds but as soon any moray becomes accustom to their new surroundings, the sooner they might/should begin feeding.
OK, you not wish to discuss the whole thing of what I asked, then just tell me these things, If you a sump and what size it is? Skimmer and which model is it? How much LR you in the tank? How many power heads and which models you are using for your water currents? One thing on those few questions young man is there are many here that can tell you that their be always a difference of opinions to those questions for maybe you not enough water currents and the same with LR, or as so, you enough LR, but not enough water currents and if this be the case, you will in time start having problems with your tanks Ph.. For like in my DME 130 tank, I have five power heads for water currents in that tank.
I couldn't find any adequate reading material that covers specific enough information to help me with the eels. Both my saltwater beginners book and my aggressive tank book only cover the basics.
That is all anywhere you will find, is that any info you might find in books or the Internet will only cover basic info and in general they will mostly sound the same, do they not? For I a while a go readied an article that Scott Michael placed together from his trip to the Japans that for only three weeks study on dragon eels and he made his determination just on those few weeks of looking at them that they not ever hang in packs, that a person cannot house anymore then just a mated pair in tanks. He is wrong in his thinking for one cannot do just a few weeks of on looking and make a professional view upon it.
He also has a wide girth
This is what you said of the betta.
An eel jaws has a wide girth too, it be at your risk in leaving it in.