I think IMO tho Remora/Urchin line should be rated half of the manufacturer stated, I had the remora, then the urchin but it's in a BC29 and it does great.
I scored an Urchin Pro but have not tried yet although I would not use it on any larger than 60 gallon system
ASM are similar to ER, under-rated so if the manufacturer states 100G medium bio-load is more than good for that