Aquarium Update 17

I started this blog mainly to document keeping a temperate marine aquarium; browsing back I see that that was more than four years back already! (see this introduction). Over time, I became more passionate about rock pooling, snorkeling and diving, specifically about seaweeds and photography, and blogged less and less about my aquarium. The aquarium had its ups and downs, as coldwater aquariums tend to be a bit more trial and error (coldwater marine aquariums do not consist of relatively slow growing stony corals as in tropical marine aquariums and house much more (higher order) diversity than tropical or cold freshwater aquariums). Also, I am a lazy man. The last aquarium update was from last November and the aquarium did not look that great, but I have lately spend more time on it and it looks much better now, so here a quick new post.I bought an upgrade Red Sea Max pump (much better) a while back, and more recently a Tunze 9001 skimmer (MUCH better than the stock skimmer, removed¬† years ago as it was so noisy). The only problem is that the pump is so powerful that the water does not get sucked fast enough in the back compartment and it starts to run dry, I need to think how to fix that. The water is very clear though. I only have Cornish suckers as fish at the moment, and it might not be safe to add other fish as there are quite a few anemones at the moment. I have collected a bunch of Daisy anemones Cereus pedunculatus whilst diving (these are very common here in Flushing). I feed all my anemones small pieces of defrosted prawn by hand, these little ones respond very well to that and I hope they will grow much larger. I also collected some more Redspeckled anemones Anthopleura balli (below). David Fenwick kindly gave me an oyster with many Jewel anemones Corynactis viridis attached (crappy pic, sorry). These did relatively well for a while when feeding fine dry foods (sold for reef aquariums) but they were bothered by the squat lobster and cushion stars and I put the oyster back in the sea (I was also worried the oyster might die and cause a huge nitrogen spike). As an experiment I removed a few jewel anemones with a scalpel and superglued them to frag plugs but they did not survive. Ah well, that might have been a first, so worth a try. With a smaller, dedicated aquarium with better filtration (to deal with many small food particles) it must be doable to keep these. At the moment there are several species of gastropods, a cute little clam, mussels, Snakelocks- Dahlia-, Beadlet- and Strawberry anemones, a small Hairy crab, Cushion stars, green urchins and a Common starfish. The echinoderms seem easiest to keep of all. I actually put the common starfish back as it was picking of all my snails which I need to keep algae in check (and are interesting in their own right of course). I added a Cushion starfish with six legs though (‘Dave’). Hopefully I can find some more anemones when diving over the summer and who knows experiment with seaweeds again.

my Red Sea Max 130D

After moving to the seaside, I was sure that I wanted to have a native marine aquarium but I was not too sure about what set-up to buy. I have quite a bit of experience with tropical fresh water aquariums¬† but marine tanks always seemed to be much more difficult with sumps and skimmers and all that. However, nowadays everyone can start the hobby with a of ‘plug-and-play’ aquarium. After a bit of online research, I decided to go for a Red Sea Max 130D. At 130 liters it is a medium-sized tank, although I guess it is still often classified as a ‘nano’ tank.


All equipment is hidden in a compartment at the back behind black-tinted glass:

130d_filtration_bigWater flows into the back compartment through a sieve, this sieve cannot be removed for cleaning which is unfortunate as it easily gets clogged, especially when you have lots of seaweeds in the tank (I do not use the extra comb (1) because I did not find it very effective and it takes up too much space). Water then flows through a filter pad (2) into the skimmer compartment (3). The stock RSM skimmer is very noisy and I only use it at night. I find that the skimmer cup is not very easy to clean either. There is an empty compartment (4, 5) for a chiller pump that I hope to fill up soon (of course I do not use the heating element (6)). Water flows then through ceramic (7)- and carbon (8) filter material before two pumps jet the water back into the main tank compartment again (9). This design is quite bad, as the filter material can only be accessed after removing the pumps and the bags are stuck in a narrow compartment. I also use a bag with RowaPhos to remove phosphates to keep algae in check.

So filtration, skimming and design could have been designed better (as well as lighting, see a previous post) and it is perhaps no surprise that internet forums abound with descriptions of RSM tank modifications and additions (e.g. this media bag and skimmer replacement option). Although I am overall happy with my Red Sea Max tank, if I would by an aquarium today I probably would assemble it from separately ordered parts.