Chicx- That's electric lava lamp Larry in my avatar. My favorite Marble I've ever had. Mature and only 7 1/2 inches across.

He's definitely one of a kind. I'm a huge fan of the midget Marbles. My favorite rays, but really like my Falks cause of their constant swimming - the Dorado of the ray world, but they get big. I have a few midget Marbles here I've had well over 5 years and they aren't over a foot. I had a half dozen living in harmony in a 6x3x1.5 with my MBU and the 8 Odoe. Would much rather have several smaller rays then a couple big ol lunkers.
I told you guys on the flat fish. Once you realize their ability to breed in the right conditions I think it's stupid not to have them. Breeding your own is almost as much fun as building epic filters yourself to care for the ridiculous amount of waste they make from eating ridiculous amounts of food.
I wouldn't have it any other way. I'm just as proud of the filtration I have as the fish that use it.
My issue is 20+ rays in house right now, water changes of 300+ gallons a day and PH of 8.5 that needs to be an RO/Tap mix to hopefully get down to low 7s and 1/3 the TDS I have now. Now the issue is getting that 300+ gallons of mixed water everyday. With over 2K gallons of tanks in my basement I'm pretty much out of room, as the tanks are already stacked.
The South American fish hate the water here. African fish love it.
Alix---- Look up Fishdog's floating nursery. It's exactly what you need, except you'll have to anchor yours due to the white water in there.... lol This would be an alternative to a Rubbermaid, or kiddy pool, but I'd definitely do the Rubbermaid. I keep 2 spares around just in case.