It is not that large yet - maybe 2 to 3 inches; he was a tank raised fish so pretty cheap - got him from aquahunaa for $20. He mostly 'lives' in the vals on the far side under a piece of driftwood but i've seen him on one occasion when i put some shrimp in the tank go to the opposite side (10 feet) pretty quickly to get a nibble. The loaches mostly stay towards my end of the aquarium where is is more open and rarely actually go into the vals; so that might be how the dynamic works. Btw my loan cherry barb hides under a rock at night to avoid the festums and my serpae mostly hide in the vals 'cept when feeding time. I think everyone is more afraid of the festums than the loaches.I've always thought black ghost knifes (knives?) look cool. But I've only ever seen little 1s in shops, chilling in a plastic tube either clear or opaque. They grow pretty big I think, but you have lots of room!!
So what is your secret? How big is s/he? Which tank is it in? Oh , I think the black substrate is your really big tank...It seems like big loaches might be too boisterous or maybe BGK is not as mellow as they seem...do tell! Are they hard to feed?