New 90 Mbuna Tank Questions

[roombo]

Hey all, new to chiclids, not the hobby. I just set up a new 90 gallon with a pool sand substrate and a fluval 2217 @ 256 GPH. Im looking forward to adding a mix of Mbuna (20-30). Questions - is 256 gph enough? I heard 5x the volume is needed? This sounds a bit much, the 2217 is awsome. What do you think? Also, what should I use to cyle the tank? Should I just start by puting in some Mbuna's and if so how many? How should I plan my stocking? All at once or 5-10 per week of so? Thanks for any advice. I plan on stocking the semi aggresive ones (labs and one or two others).
Are there any invertebrates for a Mbuna tank? And will Corys or coolie loaches ( the ones that look like snakes with stripes) be ok?
Thank you for the advice, Sean

 

[Rawimpact]

I've heard a good ratio (GPH/Tank gallons) for freshwater fish to be 4, and salt 8.

For my 50 gallon (48in long) i have the following filters

Whisper 60- 320 gph
Fluval 203- 180 gph

ratio ~ 10

I still collect a lot of crap on the bottom colorquartz, so yeah... still expect a good cleaning at least once a week.