I have a HOT Magnum sitting in a box right now. It works great to hold up some other boxes in my hallway. Here is the review I posted on another site:
I purchased the Bio Pro version of the HOT Magnum and never had much luck with it. For what it does, there are a lot of parts involved. The whole thing goes together with a lot of O rings and snap fit seals designed to make the filter easy to use and maintain.
I got everything assmebled per the manual and it was leaking air. The parts for my unit seem very poorly molded and I had to keep trying re-lubricate and re-seat the ring seals to get everything working right. It took me almost two hours to get it going with no air leak.
Once running, it did a good job for a few weeks. Then when it came time to clean the filter out, and the trouble started all over again with air leaking into the water stream. Marineland sent me new tubes and O rings but I still had trouble and eventually gave up on the filter. Seems like the problem is now with the filter lid seal.
I put the filter back in the box and it went into the closet. I feel like keeping the thing running on the tank is like asking for a disaster =/
One more thing, these are not "real" canister filters. They require much more maintence than a standard canister and the media options are severly limited.
I got a Eheim ECCO to replace the HOT Magnum and have never looked back. The ECCO is much better built and something I actually trust. The parts that make up the Magnum are very cheap feeling and do not fit together well.
2x Sunburst Platys (2M, 2F) // 3x Neon Tetras (?) // 2x Cherry Barbs (1M, 1F) // 2x YoYo Loaches (?) // 1x Bushy Nose Pleco (M) // 1x Clown Pleco (?) //
-30# Live Rock
-Mixed Snails (Nassarius // Cerith // Astrea // Black Turbo // Mexican Turbo)
-8x Blue Leg Hermit Crabs // 1x Banded Serpent Star // 1x Cleaner Shrimp
-1x Royal Gramma // 1x Percula Clownfish
-2x Mushroom Leather // Metallic Green Star Polyps // Pulsing Xenia // Striped Xenia // Blue Mushroom
-Remora + Maxi-Jet 1200 // 2x Maxi-Jet 600 // Maxi-Jet 400 // Visi-Therm Deluxe 50 // Current USA Orbit 2x 40w PC