First off, crabs are evil heh. They are opportunistic predators which means they will eat anything that they can catch. Whether it is snails, urchins, coral, or even fish as they get larger. I recommend removing the crabs and getting a clean up crew for algae and detritus. A few different types of snails, an urchin, serpent starfish, and/or ornamental shrimp such as cleaners are all good members of a clean up crew.
I have had a lot of algae since I put my 192 watt lunar aqualight in my 46 gallon bow which was to be expected
What type of source water do you use(ex tap water, RO
)? With higher light levels smaller amounts of algae fuel are going to become an issue. Nitrate, phosphate are the two biggest causes of nuisance algae outbreaks. I would test for both in your source water and tank. NO3
should be <15 ppm
=/< .03 mg
/l ideally to avoid issues.
Also I have 2 30-60 gallon whisper power filters on my 46g bow. Someone told me they were nitrate factories what filter unit can I buy that will do the job for my whole tank like 500 gph or more????
I'd recommend the "berlin method". All you need is 1.25-2 lbs LR
, good water flow (15 x per hour tank turnover minimum) and a GOOD skimmer. Other than those things, a place to run GAC
or a phosphate reducer like Rowaphos or Phosban is good to have. I would use a HOB
filter w/ no mechanical filtration, only chemical media. Mechanical filters ie. sponges, floss, tend to clog and need cleaning once or twice a week. If not cleaned regularly they start producing excess nitrates.