Didn't mean to come across rude.
I have been a Channa enthusiast for a long time, and drill it in to myself to keep my fish in suitable housing.
IMO an 8ft tank is not near enough for a Micropeltes.
I kept both of mine in that till they were big enough for the pond.
After a while in the pond, it became rather boring (end expensive) feeding them but not being able to actually see them, so they were given to the wetlands, rivers, and invasives centre which I frequent.
Mine all grew very fast, and if kept in CORRECT environments, they should very easily hit the 2.5ft plus size.
It's a forum, we all have opinions. My opinion is Micropeltes and Marulius are only suitable for ponds or tanks of that size.
Cheers.